Booleans and Branches are your best friend for these kinds of things.
You can have one Boolean (true/false) for when a widget is open, and if it’s true, then don’t allow any other widgets to open until that Boolean is false.
You can do the same thing with the trace. You should AVOID using Event tick for anything, wherever possible. You shouldn’t be tracing from event tick. It sounds like you’re using VR, so you could have a trace fire on a button press instead of event tick.