I have following problem after I installed some from the debian packages - the font is not currently found, or there is some other problem, which makes the GUI nearly completely unusable:
. The distribution is current Debian Buster, the locale is cs. The liberation fonts are installed, but still no success, the font is substituted by something else - or this is completely different problem...
Same result for installed version teamviewer_14.7.1965_amd64.deb or teamviewer_14.6.2452_amd64.deb
After upgrade from stretch to Buster and upgrade from versiopn 13 to version 14 I was not able to use the software at all.
I found out, the problem is caused by the screen scaling option. If the screen scaling in KDE (can be set in the system settings / Screen and monitor / Change screen scale) - it the scale is set to 1, then the screen looks normally. In the screenshot above the scale has been set to 1.2
I think, thsi problem will be in every Teamviewer version, it would be nice, if teamviewer could support also the scaling correctly, because it is important for the screens with largen resolutions, where the dialogs and fonts woudl be too small for the screen..
I faced the same issue and i tried others way to succeed and they are not showing the right path.