P: Lock Cell Size in Print Module

Since I posted this in 2021, and it still hasn't been implemented, I thought I'd post again.

Please allow to set the cell size, then check a box that says Protect Cell Size so I can move margins but have them stop from encroaching on the cell size.  I have to keep going back and forth, an finessing between Margins and Cell Size.  Hard to believe that Lightroom is around almost 20 years old and this is still annoying. So simple, it would look like this:

Gridlines, like in Photoshop,  for laying our greeting cards would be nice too.

Reid