NinoVSoriano

I'm not sure what the task is, but you have a lot of options with the corner tool, and in addition there's a lot of possibilities with the rectangular tool as well.
 
 

The task was to create a shape like the blue one in the middle of my screen shot, Madame. The task was not to round the corners, but to bend one side of the rectangle inwards. I updated my post to reflect your comment. Thank you very much, and let me apologize for the confusion. :)
 
And thanks for your idea as well. Yes, I am aware that you can also kind of use Matt’s Corner Tool for this purpose (see below), but I believed that would have been a suggestion too difficult …  ;)  

Hi everybody,
 
I got a question through a personal communication, but since I don’t know how to attach media to messenger communications (does anyone know?), I took the liberty to transfer the discussion to this place. The question concerned the creation of a rectangle shape with sides bent inwards, just like the blue shape in my screen shot below.
 
In reply to this, two different methods came to my mind. First off, the free-hand method:
Create your rectangle with the Rectangle Tool. Convert it to curves using Layer > Convert to Curves. Select the Node Tool, grab the path between two nodes and drag it inwards. Click on the path and drag without releasing the mouse button. Otherwise you will create an additional node on the path. Secondly, the constructive method:
Create your rectangle with the Rectangle Tool. Then create a circle or any other curved object of the desired shape on top of the rectangle, such that it intersects the rectangle in a way that you would get the desired side curvature, if you subtracted the curved shape from the rectangle. Finally do this subtraction by clicking the Subtract button from the main toolbar (clicking the button with Option held down will make this operation nondestructive). Alternatively, you can choose Layer > Geometry > Subtract, but this will always be destructive. As a second alternative, you can create a compound through Layer > Create Compound. Afterwards you will have to go to the layers list, expand the compound and select Subtract as the compound type (see below). I hope that will help. If there are other techniques, feel free to add them. The more the better …   :)
Cheers, Alex

Subtract.afdesign

evtonic3: They can be grouped (or Boolean added or compound added etc etc etc). Nesting placement is the only key.  :)

I missed this basic technique, I was under the impression there needed to be groups to get the children inside. Cool.

Hi Nino,
 
and welcome here …  :)
 
Clip your rectangles to the circle by making each rectangle a child of the circle in the layers list, just like shown in this video:
 
https://forum.affinity.serif.com/index.php?/topic/4069-layer-clipping-vs-layer-masking/?p=16825
 
Additional information on layer clipping can be found at Help > Affinity Designer Help > Layers > Layer Clipping.
Hope that helps …  :)
 
Alex