Question
Change colour of background box
HELP!!!
(working on Acrobat build version 23.1.20177.0 on a mac)
I am trying to edit the colour of the blue background object:

It has textboxes over top:

I cannot change the colour in any way... right click - no luck. Ctrl- e, no luck...
Any suggestions as I am editing a periodic table and it would take hours and hours to delete, redraw rectangle, etc (and when I do that it grays out the text in front even if opacity is changed....(also if I reduce opacity then the border changes correspondingly)
Thanks for any help you can give me!