how to store postprocessingvolume between levels

Ok, so the PP affects the level, but not the menus, right?

And you want to set the PP in one level, and it applies to all levels?

Are all the levels just menus?

( sorry for all the questions )

No only one level is a menu and the rest is gameplay levels. Sorry for the late answer forgot about it, but it would be nice to have the pp on the main menu as well but it is not necessary