- Does it look the same in the Help Vault?
- Do you have a custom CSS? (I can’t tell just by looking.)
The setting I mentioned only exists in the local graph.
That’s an older version of MacOS. I wonder if there are any new compatibility bugs since CodeMirror got updated. This might have started happening when you updated Obsidian to 0.12.17 when CodeMirror was updated. (That is just a guess. I don’t know what library is responsible for the graph.)
If you’re willing to try a technical fix, one thing you could try is to delete or move your Obsidian application preferences.
But if you do, make a backup of the folder first!
~/Library/Application Support/obsidian/
Reinstalling the app might not refresh any of these settings. But deleting the folder would. Your vault should be safe, because your vault settings are stored in your vault. But you would have to add your vault back to the list of vaults. Again, if you do this, make a backup just in case.