I use opensong on Ubuntu 20.04 LTS. The setting of fonts in General Settings -> Appearance works for all categories except the "Fixed-width Text" setting. I attach a screen shot to illustrate the problem. For me this is a severe shortcoming because it becomes impossible to type chords without a fixed-width font.
Anonymous
Hi,
I stumbled over your bug report by accident while searching through my inbox and noticed, that according to your screenshot, you assigned a mono-spaced font to "Text Fields" but a proportional width font to "Fixed-width Text".
Accordingly, the text in the text boxes like Title, and Author are fixed width, the lyrics text however is proportional width, just as set up. To me it looks as if Opensong behaves just as it should.
I have no linux system at hand to check it, but I believe, there is no bug, but only a misconfiguration.