Same Excel file is in previous post, different problem: the sheet uses the first 51 rows, the .xps output stops after 59 …
How do I make sure the conversion takes all the visible content of the tab?

Oh, you really mean .xps? I thought it was a typo and you meant .xls. Why .xps? No one uses it. Get a pdf print driver.

Your assertion "nobody uses it" is clearly incorrect, because I just posted a question about using it. We use .xps quite a lot, so we can publish document snapshots in SharePoint that open immediately in the browser. If I had wanted to use Acrobat, I would have used Acrobat.
As for the problem, adjusting the print layout settings did the trick.