First, select Add Shape, and a solid shape filled with gray will be added to the image (a very silly design). After selecting the shape to be edited, there will be 4 buttons at the bottom, click the third one. In the secondary menu, pull the Opacity slider to the far left, and then return to the previous menu - there are four buttons at the bottom. that. At this point, the two buttons on the left will come into play. The first one is used to select a color, and the second one is used to adjust the border thickness. Once upon a time, this was simple, but now it has become so complex.
[Edited by Moderator]