Correcting dimensions of the boxes with + and - in "Set Page Boxes"
In every Adobe program it is possible to correct sizes by adding a value with + or -. Why isn't it possible in Acrobat menu "Set Page Boxes"?
Can you please be little more specific?
Are you talking about “Change Page Size” → “Custom” option where you want this functionality?
I'm talking about the menu "Set Pages Boxes" where you can correct the TrimBox, BleedBox, etc. It's placed under "Organize Pages" > "More…" > "Set Pages Boxes" (Shift + cmd + P).
If I have to correct the TrimBox, I would like do add the value just by writing "+1,5" (e.g.) behind the existing value (as shown on the screenshot).
If I do this now an error message appears ("Invalid numeric value.").
I hope I could make it a bit more clear :-)