My Gnome system font is correctly applied to menus and other GUI components of LO, but internal dialogs like the Options window are much smaller. My monitor is 3000x2000 and the system scale factor is 2x. xrdb correctly reports a dpi of 192.
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 19.0.2
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
Created attachment 152243 [details]
Compare menubar and options fonts
we're reworking all internal dialogs to have a native look & feel.
Could you please try to reproduce it with a master build from http://dev-builds.libreoffice.org/daily/master/ ?
You can install it alongside the standard version.
I have set the bug's status to 'NEEDINFO'. Please change it back to 'UNCONFIRMED' if the bug is still present in the master build
Sadly it is the same, I can perfectly reproduce it in the latest master build :(