The folder formats system in Opus is arguably easier to understand and manage than the one in Explorer:
The main difference is we don't automatically save changes you make. You have to save those yourself (or set them up for types of folders, or everything below certain folders, or folders that mostly contain images... whichever you want!).
We don't think temporary changes should be saved automatically, since people usually want to set things up a certain way and then keep them that way, even if they switch on a column or change display modes occasionally to do something special; you shouldn't then have to switch everything off to get back to normal again. That said, it is possible to configure Opus to do that, we just don't recommend it. (Although a button which saves the current format for the current folder and/or subfolders can be useful when you're first setting things up, and that's easy to add to a toolbar or hotkey.)
Unlike Explorer, Opus won't start arbitrarily forgetting your folder formats if you've saved too many of them, and you can always review and edit all the formats you have saved via Preferences, instead of them being opaque binary data saved in the registry that nothing can view.