Why can't I print outlined empty cells in Calc?

I’m at a midway point in designing a paper form, and I wanted to print out a copy of just the outlined cells to see how they fit on the page and worked with the hole punch, but print preview says no data, I tried printing anyway and got a blank page. Help please.

Try to fill cells with one blank just before the print. Select cell range, enter a space, close with Alt+Enter, which inputs the content into each selected cell. After printing press Ctrl+Z to undo the fill-with-space step (hopefully works like this, I didn’t try).

Tried this, but it didn’t work. Tried adding some other elements, numbers and background colors, and they show up in Print preview, but the outlines still aren’t showing up at all on any of the cells.