Image 1 shows my default font of Obsidian which I Iike a lot. However, the font changes itself to something else occasionally (image 2) and there is no way for me to change it back.
This problem affects both my Mac and iOS versions of the app.
The default font does not appear to be an option in the appearance setting. I also do not have any font set up.
How do you set your “default font” without setting them up in Obsidian’s settings ? 
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Do you use a plugin/CSS Snippet instead of using the font installed in your system ?
Hey Pch, thanks for your reply. The default font is the font I got when I first installed Obsidian. I don’t think I have any plugin for font (except “Style Settings”), and I don’t know anything about CSS Snippet.
When the font changes itself, it changes back to the other font on its own later (completely random) without any interference.
