Engine plugins are controlled by the “Show Engine Content” flag, so you can turn those off, and if you have some project specific plugins showing up that’ll never have content, you can edit their .uplugin to have “CanContainContent”: false
The idea to have an additional ‘show only the game feature plugins’ option is interesting though, but at that point probably those settings need to be an enum or something instead of a bunch of bools, and feature plugins are also basically invisible at the engine level, they’re done in a plugin as well (though hard-coding the GameFeatures prefix path wouldn’t feel too bad).
Cheers,
Michael Noland