Hi @ClarkyPA365 this is possible with an If() statement in the Items property of the dropdown.
Let's take 2 examples (1) being a self-written array, (2) being a choice column of an SP list.
(1)
//3 only appears when the toggle is switched on
If(Toggle1, [1,2,3], [1,2])
(2)
//Show all values if toggle is on, else show 1 value less
If(Toggle1, Choices(LISTNAME.CHOICEFIELD), Filter(Choices(LISTNAME.CHOICEFIELD), Value <> "NAME"))
If this solves your question, would you be so kind as to accept it as a solution.
Thanks!