Do all USB devices get passed through?

[SnowyJaguar1034]

Sorry if this is the wrong place but I'm wondering if you need to specifically declare which USB devices get passed through. I'm thinking of using my Pi400 as the master brain of my UPS control which means I need to connect USB devices to the Pi and I'm hoping these devices will default to only working on the Pi and won't be passed to the externally connected device.