For making change in size of any field in print form template, you should open Administration - > Service Tools - > Print Form Templates.
There you should find a print form which you need to edit.
Open chosen template For Edit:
For making change with the size of cells
1) increase: you should highlight empty area under or upper of needed cell and push the button “Merge selected cells or split if merged”
After it, you need to merge needed cell with parameter with strings below it (you should also highlight it and push the same button “Merge selected cells”).
...
In Properties palette, you need to choose Text placement to make format of text in chosen cell. (Here it might be chosen - Auto, Block, Clip, Wrap).
After it, close Properties, close template of print form.
...
Then you should highlight some of these cells from the first one and again push the button “Merge selected cells or split if merged”:
This cell will become smaller.
...