inferior fonts rendering in presentation's slideshow mode

Recently, presentations in slide show present some fonts much smaller than the expected presentation. I attach two screenshots from my laptop. The first is in regular view, and the second is the same slide on the same computer in the slideshow view. You can see the awkward presentation of the text below the graph. On my desktop computer, there is no problem (same version and os). Any ideas on how to solve it or how to gather more information on the problem?

version information:

Build ID: 00(Build:1)
CPU threads: 8; OS: Linux 5.8; UI render: default; VCL: gtk3
Locale: en-US (en_IL); UI: en-US
Ubuntu package version: 1:7.0.3-0ubuntu0.20.10.1
Calc: threaded

(Edit: activated screenshots -AK)

I had the same problem. Check your display settings in Ubuntu. My scale was 200% instead of 100%. I changed it to 100% and the problem was solved.