I am trying to insert a custom rectangle around an illustration in a PDF with Acrobat Pro 2020. That feature, which used to be standard in Acrobat, is now gone, or at least I cannot find it in the various editing screens that come with Pro 2020. Is it gone, or is it somewhere that I cannot find?
On the far right of the selections/options you see a bunch of shapes, that's a dropdown menu to let you select the tool you want. To the right of that you'll see the controls for these such as the red (change colors), lines (thickness and broken or not), and text (font, size colors, etc.) These will also add a region to comment on but that's up to you. Not obligated to do that.