I can't save themes

when I download and install themes then exit and go back to obsidian, it comes back default theme

The community will probably need just a little more information before they can help you. How are you “downloading” the themes? Where are you getting them from?

If you use the interface, no further interaction should be necessary.
Settings → Appearance → Manage

This will bring up the available community themes you can use. Is this what you’re doing?

Post your debug info from the app “Show debug info”, and tell us more information. Like the OS you use, and any syncing tools you use.

My guess is you are using a syncing app - oh just let me guess… iCloud on Windows? - and you have file duplication conflicts in your .obsidian settings folder.

yes I just use themes in the available community themes

thanks, i fixed it