Can't turn off, disable or delete Post Process volume/effects

Hi! After migrating to a new project, I can’t disable or tweak post processing. I tried deleting Saved+Intermediate and then restarting, sometimes in combination with disabling or enabling Mobile HDR in the project settings before or after.

Sometimes, when the project restarts, it grabs settings from the PP volume - but oftentimes not all of them - and then they’re (or some of them) stuck, and I can’t tweak them in-editor. I delete the folders again and some of it resets, but not all of it.

This is a brand new project with old content migrated from a project that’s using the same engine version (4.10.4). How do I completely clean out everything concerning post processing in the level or project? Migrating obviously didn’t work since that seems to be the cause.

Thanks!