So the Easiest way to make your Rectangle with preferred Rounded Corners settings is:
- Select the Rectangle Tool
- Do Not Drag but only Click on your Document Area
A window will Pop-Up leaving you to enter directly the Rectangle Settings...
Corners Settings... :)
Some Exta Indications are Contained in this other Guide:
Climb the InfoWall

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Climb the InfoWall
Fedora Fedora Fedora, Linux Linux