I just installed Obsidian on fresh install of Linux Mint. Once I opened my vault, I see that the horizontal spacing is wrong; each space takes way too much space. In addition the numbers in titles are in wrong color.
Found it! I had selected “Roboto” as main font, and “Noto Color Emoji” as the second one. Likely one of those was not installed on this system. Now if I put “Inter” as the first font, it looks fine