The Bridge Devices page shows active bridges (with live online/offline status computed from when they last checked in, refreshed every few seconds) separately from a second, inactive list — deactivated bridges you may want to re-pair later rather than losing entirely. Deleting isn't exposed in the UI at all; deactivating (unchecking Is Active on the bridge's edit screen) is the only way to retire one, and doing so immediately revokes its pairing token so it can no longer sync or print.