Test if the component (in this case a label) is visible. If not visible, then make it so.
You can put your if statement in your workflow, it doesn’t have to be a button click
or more simple: just use the set Label1.Visible to true without the if statement, because if it is already visible, to set it to visible does not change anything...
for new questions, please start a new thread, and as I have seen, you already did that...