I have been playing around with preferences in Octave and I did something to have completely messed up the tab text size and I am unable to restore the setting to factory install.
E.g the tab text size is very small as shown in the image
I tried Window -> Reset Default Layout
but it didn't work
Qt settings are in the
C:\Users\(current username)\.config\octave
folder.
You can delete config files to reset layout settings.