From Preview screen of Labels, switch to Layout mode.
Then go to Layouts => Layout Setup => Printing.
Adjust the appropriate margin by a few pixels. For example, to correct the problem with losing part of the first letter in a line of text along the left margin, Deb changed left margin from 3px to 9px, which corrected the problem beautifully and left a nice 1/4 inch margin along the left side of the page.
Test on regular paper before you print on label paper.
Work-around if needed:
Right-click on Preview screen of Labels.
Select “Copy page.”
Open Word document.
Paste copied page.
Adjust as needed before printing.