Polygonius

This will be because we apply similar streamlining rules as we do to the Affinity documents.  For speed reasons, we append changes to the file, then only periodically "defrag" the file when it reaches a certain % of dead data.
 
So, if you delete stuff, the file will still grow instead of shrink as we write out a new copy of the main file data, but don't do any housekeeping until it reaches 25% redundancy at which point all the dead bits are removed and the file will shrink.
 
You'd have to delete 1/4 of your brushes (approximately) to cause a streamline, though that is subjective.
 
 

I don't think it's a completely correct and exact wording, but for a certain type of editing, it works like this. In general, and it's a very common and often used technique, not to constantly waste time restructuring the file, but to add new stuff to the end of the file. Only when the specified limit for ballast (gas - as Walt writes) is exceeded, or SaveAs is made, the file is rearranged and compressed.
I used to request that some command be added to defragment/compress the file and it didn't have to be done the silly way via SaveAs, but alas.
 

The Affinity file architecture is designed to grow with each update you make, as changes are written to the end of the file, which leaves "gas" or unused old space earlier in the file. When the file has grown enough, it will get trimmed the next time you Save it.
Or, to trim earlier, you can try using Save As to a new file name. 
 

That may work now but as I reported in this topic just after 2.5.5 was released that link took me to the 2.5.3 release notes topic.

Requests to change the program functionality need to be made in the Feedback forum, not the Questions forum, @Polygonius.

But it is better for the OP to post in the correct forum originally, as it makes less work for the moderators and allows them to provide service to more users. 

I own AFFINITY SUITE - so iwant create/edit/save.... with all the possibilitys of 3-apps together in ONE APP (one file/one folder/one doc-change....) I dont want this AD/AP/APUb...finder(explorere. tohuwabohu... I WANT AFFINITY SUITE (maybe Real NAME*. ass as compi-suffix...)
SUCH FILES are just for SUITE-OWNER openabele in SUITE (Each SUITE has has its "Personas" wich will intern direct link to FULL-AP/AD/Apub... 
THERFORE i have BOUGHT the SUITE...  I dont like different AD; AP; APUUB files in my finder/explorer... i want just ONE file and all the TOOLS from the 3 apps in one HOST_app... the AFF-SUITE...  with personas... it would be so easy... FULL AP/ APUB from inside AD or viceversa... FULL AD from inside AP/ and full of booth from APub... 
THEREFORE i bought the SUITE, not for  ... extra-orgenize all brothers (in seperate folders... or the same... but this TWIN/GEMINI... is without elders...  and horted in another folder..

I own AFFINITY SUITE - so iwant create/edit/save.... with all the possibilitys of 3-apps together in ONE APP (one file/one folder/one doc-change....) I dont want this AD/AP/APUb...finder(explorere. tohuwabohu... I WANT AFFINITY SUITE (maybe Real NAME*. ass as compi-suffix...)
SUCH FILES are just for SUITE-OWNER openabele in SUITE (Each SUITE has has its "Personas" wich will intern direct link to FULL-AP/AD/Apub... 
THERFORE i have BOUGHT the SUITE...  I dont like different AD; AP; APUUB files in my finder/explorer... i want just ONE file and all the TOOLS from the 3 apps in one HOST_app... the AFF-SUITE...  with personas... it would be so easy... FULL AP/ APUB from inside AD or viceversa... FULL AD from inside AP/ and full of booth from APub... 
THEREFORE i bought the SUITE, not for  ... extra-orgenize all brothers (in seperate folders... or the same... but this TWIN/GEMINI... is without elders...  and horted in another folder..

I own AFFINITY SUITE - so iwant create/edit/save.... with all the possibilitys of 3-apps together in ONE APP (one file/one folder/one doc-change....) I dont want this AD/AP/APUb...finder(explorere. tohuwabohu... I WANT AFFINITY SUITE (maybe Real NAME*. ass as compi-suffix...)
SUCH FILES are just for SUITE-OWNER openabele in SUITE (Each SUITE has has its "Personas" wich will intern direct link to FULL-AP/AD/Apub... 
THERFORE i have BOUGHT the SUITE...  I dont like different AD; AP; APUUB files in my finder/explorer... i want just ONE file and all the TOOLS from the 3 apps in one HOST_app... the AFF-SUITE...  with personas... it would be so easy... FULL AP/ APUB from inside AD or viceversa... FULL AD from inside AP/ and full of booth from APub... 
THEREFORE i bought the SUITE, not for  ... extra-orgenize all brothers (in seperate folders... or the same... but this TWIN/GEMINI... is without elders...  and horted in another folder..

A.) If you want to change the artboard size but keep all nested layers in their current size + position, you have this options:
1. Select the artboard with the Move Tool + activate the "Lock Children" option in the Context Toolbar…
2. Select the Artboard Tool…
3. … then drag a corner handle of the artboard with shift key pressed
4. … or type the wanted size … or scaling ratio in the Transform Panel.
B.) If you want to scale an artboard + scale all nested layers:
1. Select the artboard with the Move Tool and de-activate the "Lock Children" option in the Context Toolbar,
2. then continue with A.) 3 or 4.
 
 
 
For a discussion about understanding the Affinity Suite …
________________________________
 
lerne zunächst,
======================
 
dien Gdnkne zu srtieren,
--------------------------------
in Sätzen zu formulieren,
BEHUTSAM Buchstabe für Buchstabe zu tipp
 
en
 
 
 
and sinnlese Leerzellen einfach wegzuallsen.
"Thats MAST_Behavior" um verstanden zu werden.

Did you release the mouse button after selecting the text… then press + hold the mouse button down for dragging?

text dragging.m4v At least on mac it works in various apps, not Affinity only.
This way you can drag a text selection even into a macOS Finder window to save it there as snippet (file type: .textClipping)

Or once (or 4 or even more times) … depending on your situation. With no text selected 1x is enough and multiple times don't change it.
By the way, if you want to move  selected  text between text frames you don't need to leave the Text Tool, you can drag  selected text with the mouse button pressed into another text frame. (or use copy paste)
To visually hide a selection's bounding box or an ants marquee you have various options, additionally to your shown button "hide while dragging".
Depending on your situation you can …
• press/hold the Space Bar on your keyboard.
• switch to "Preview Mode" via Toolbar button or menu or shortcut.
• hide the ants marquee ("Pixel Selection") via menu or shortcut.

It's because other people besides the OP may read topics like this & they may find related info helpful. This happens frequently & I believe it is generally considered beneficial to the community as a whole. I assume that is why @Return replied to @thomaso's question, & why @thomaso asked it in the first place. Also, as far as I can tell, nobody "rejected" @thomaso's original answer. 
Besides, @Polygonius was the OP & marked several of our posts with a 'like' so I assume that extra info was useful to him or her, as I hope it will be to others not familiar with why sometimes pressing ESC more than once is necessary.

Thanks guys! Hit twice( or 3 times) ESC works fine.
This happens if you use a REACTANGLE as your background, instead the ARTBORD itself.... or bigger groups... in sub- groups.... each click outside will jump the focus to its parant/parant/more background....  In 98% cases i want this behaviovor... but SOMETIMES not. This 2-3% cases i dont want are: I+m deepdive working on an object..- i dont want to see the ANT_Lines and other "selector-guides/boxes"....  But this 03% percent the case, so the default.... gets higher and higer depending on click i say welcomme!
 
BUT SOMETIMES (3-4% percent i dont want to see, neither an "ant-line" nor a selector-box--- nor someting other like this...."
WHY not disabele this temporailly LIKE the show pixel/retina2/x-ray....view.....) ???

Press the ESC key to leave the text editing mode, then press a tool shortcut (V, B, …) to switch the tool.
This does not happen to me in V1. Here clicking an empty layout area does neither select a parent group nor the parent artboard layer, but just unselects the previously selected object. And, then double-clicking the previously selected, nested object in the layout window does select it again.
Can you show a video demonstrating the unwanted auto-select behaviour, including the Layers panel with unfolded layers and the panel option "Auto-scroll" activated?

.

As @Return shows, if you have text selected (highlighted) in a text object, tapping ESC once just deselects that text but leaves the cursor active at the insertion point in the text so if you were to type V afterwards it would insert a V in the text.

"It's not me, it's my brain."
Isn't it up to you (as writer of your posts) to follow your brain's thoughts and control your typing or translating speed? – Otherwise you could add "fast/rough" to any of your posts, just as an excuse in advance.
There is an Asian proverb: "We don't have much time, we have to proceed slowly." – "Wir haben wenig Zeit, wir müssen langsam vorgehen."
Als Alternative kannst du auch auf deutsch schreiben, das könnte es für Dich + das Forum weniger missverständlich machen. – Stichwort "milk-girl-equalation by inti-post", … daran scheitert auch ein Übersetzungsprogramm, das es dagegen aus dem Deutschen für englischsprachiges Publikum fehlerfrei hinbekommt (milkmaid bill), … wenn Tipp-Fehler* den Inhalt nicht zusätzlich verschlüsseln: "inti" = anti?
*die allerdings nichts mit Denk-Geschwindigkeit zu tun haben, sondern mehr für Nicht-Hingucker typisch sind.

My example has a little/small glow because you mentioned it initially:
Nevertheless, your problem with increased size of a glow if exported …
… doesn't happen to me with a small, medium or big glow:

For clear problem description you might need to show a screenshot with your glow & setting and your exported result.
If you rather export the text frame only and have the resulting image dimension in mind: It is known ("by design") that these effects (blur, shadow, glow) seem to increase the exported image dimension, as far I remember by 50% of the used effect radius – regardless of their "visibility" (for human eyes).

The "Affinity Spotlight" articles often introduce kind of masters of their work. A search for their names might lead you to an according tutorial on other websites. For instance:
"The art of crafting things with Felix Hernandez" or "Naturalistic illustration" by Isabel Aracama …
https://affinityspotlight.com/article/level-up-your-skills-with-top-tips-and-tricks-from-affinity-pro-users/
https://affinityspotlight.com/article/keeping-it-real-the-photorealistic-automotive-art-of-richard-kelly/

Hi @Polygonius,
I'm not aware of anything tutorial wise that we (Affinity) have created that covers this, happy to be proven wrong if anyone else reading this is aware of one
A quick search on YouTube for Affinity metal textures, or swap out the word metal for whatever texture you are looking to create, should return a number of results, which could get you started.  

Shift+Command+K is hardly the industry standard for creating a symbol (at least to my knowledge), it's just the keyboard shortcut that Serif chose to assign to this function. Since it triggers a menu command (Layer > Create Symbol), it's configurable! Just choose whatever key combination seems appropriate to you.

I can't reproduce a glow increased on export. What Affinity app + version + export setting + export file format do you use?