How can I get an imported document to print whole page

I have a document that was imported into Excel,when I try to print(landscape)
it only prints part of the pagemthere appears to be a break,I am not a wizz
with Excel & not sure how to fix.

If you'll click >File >Page Setup and select the Sheet tab, is there a
Print Area defined? This is the place to alter print settings to your
satisfaction.