Bitwig's Exclusive Solo mode automatically clears any previously soloed tracks the moment you click a new one, saving the extra click of manually un-soloing. Right-clicking any Solo button toggles this behavior on or off, and Shift-clicking always performs the opposite of whichever mode is active.
Solo as Cue repurposes the Solo button into a focus tool. Turning the cue mix up gives you a straight solo; pulling it back dims everything else rather than cutting it, so the focused track sits in context instead of in isolation. That relative blend is especially useful when editing vocals or doing detailed sound design work where losing perspective on the full mix is a real problem.
Both settings live in the right-click menu of any Solo button, and mapping the cue level knob to a hardware controller keeps it immediately accessible during a session.