modrinth crashes when pressing the 3 dots to open export and settigs menu aswell as crashes on logs screen.
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Modrith
Modrinth is a game launcher, available in Flatpak. By doing a quick Web Search I found one or two possible solutions…
You might first ensure that the Flatpak is set up right:
flatpak repair
flatpak update
Then you might try to launch it in a terminal something like…
flatpak run com.modrinth.ModrinthApp
Sometimes we just need to remove the application config files, and I’m not too familiar with the location of those for a flatpak.
It’s also in the AUR and available as an AppImage. 
So more information is definitely required here.