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Thanks for your reply but that does not help.
How do I delete all effects for the group? Or for an individual clip?
It completely depends on the specific effects and edits applied. For many edits, such as Fix/Enhance or FX, you can click on the "i" button at the start of the clip and deselect/uncheck the listed edits.
For others, like CLUTs, there's no way to remove the changes without manually deleting the clip and adding it to the timeline again. You may find it easier to go back through the autosaved projects until you find one with the clips you can't undo in their original state, and then copy and paste them into the latest version of the project