R C-R

If you talking about using the AP Mesh Warp Tool the Apply button is on the context toolbar. If the context toolbar is hidden, unhide it by ticking the "Show Context Toolbar" item on the View. menu.

That will always happen if you export to PNG because PNG is a raster image format.

Glitch or not, it seems to work in the Mac versions of both AP & AD. The most weird or glitchy thing about it is it does not appear on the Layer menu, where the other 'convert' items are located.

I don't know of any preference setting that could affect this. All I can tell you is it works for me in all 3 Affinity apps, although finding the correct 'landing zone' to get what I want can be a bit tricky/hit or miss. But it definitely moves somewhere when I drag it.

You are clicking & holding on "Colour" before you try dragging it, right? If you just click & release the mouse button, it just selects that panel in the tab group.

Did you try clicking on the name of any of the tabbed panels, for example on the "Colour" tab in your screenshot & for example dragging that onto the tab group below it, the one with Navigator, etc.? You should be able to do that or to drag the tab name to the left or to the right in the same tab group to place it to the left of "Histogram" or to the right of "Swatches." Likewise, you should be able to drag it completely out of the Studio so it becomes a floating panel.

Because all three Affinity apps share a common native file format & all support all the same object types (even though not all can create them all). much more than you might think is not specific to just AP, AD, or APub. So for instance, in all three apps you can rearrange the panels & save them as Studio Presets in tha same way.

Have you ever tested any of them on comparing PDF documents created by different PDF creation softwares (versions or engines)? Do they work well for that?

If you click on the panel on the icon with two vertical lines, you should be able to drag that panel wherever you want. This should work for tabbed panel groups. For individual tabs in a group, you should be able to click & drag on any one of them & move it into another tab group or into a section of the panel by itself (IOW, ungrouped). It can be a little tricky to master this but once you get things set up as you want, you can save & name this as a Studio Preset via the View > Studio Presets > Add Preset... menu item, & recall it later in View > Studio Presets by selecting its name.

Yes, I know that. But my point is if the PDF files have a lot of different text objects in them then just opening them in some app that allows copying each of them as text objects & then pasting it into a BBEdit document (& making sure everything is pasted in the same order) could take a very long time. For example, consider something like two versions of the GraphicConverter User manual PDF. I have PDFs saved for versions 9 (about 340 pages) & 11 (about 500 pages). Almost all their pages have multiple text objects on them, & I do not have any app that can open either one & allow me to select every test object in one step. How would you handle something like that?

Your first two screenshots show options for the Artboard Tool. Again, this has nothing to do with exporting all or part of a document or creating a new document. That tool just creates artboards of various sizes, like the same size as the already-created document or a selection of some or all of its parts. The Export settings control what area of the document gets exported. The options for the area depend on several things, like if there is one or more artboards or if anything is selected. For example, with two artboards you might see something like this: Refer to the chart in the help topic to see which export formats support what DPI in the export formats that support setting DPI independently of the document DPI (which is set during creation of new documents or changed at any later time via the Dimensions tab in the AD File > Document setup menu item.

Just using the tooltip names would be enough.

It seems from your screenshot that you are talking about the AD Artboard Tool, right? By "mounting area" are you talking about creating a new artboard or something else? Either way, I am not sure how this relates to importing a document, since the Artboard Tool is not used for that.

OK, but as I understand it, since you are consistent in how you name files what problem(s) do you foresee having if you upload JPEG files using a mix of both extensions?

If there are a lot of text objects in the PDFs, I suspect it would take substantially more than a moment to do the comparison that way.