All fonts on the menu bar (Writer, Calc) have a very small font, almost unreadable, and I cannot find how to increase font size. I can change the size and font of the icons on the toolbars, but not on the menu bar. I am using openSUSE 42.3 LEAP with XFCE and LibreOffice 6.0.4.2. Please send me help to increase font size on menus.-
I also ask the same problem, but as I see no answer until now ??
i have same problem
I ran into the same issue upgrading from Xubuntu LTS 18.04 to Xubuntu LTS 20.04.
The cause of the problem lies with the fact that I was using libreoffice-gtk2.
Since quite some time XFCE has been adopting GTK3 in favour of GTK2.
Apparently, support for GTK2 has waned to the point where we are seeing these font errors now.
The solution to this small font problem is relatively easy:
$ sudo apt install libreoffice-gtk3
$ sudo apt purge libreoffice-gtk2 libreoffice-gtk
An almost identical issue was discussed in this bug report.