because its a shet control it takes care, and multiple clicks.
But you need to be very careful
Ok, so you have the blank settings tab, and you've selected the Settings Template from the Control Templates pad.
click once near the top right of the sheet.
Then move the mouse down about a cm, and a few pixels to the left.
slowly click once. then twice. (I don't recall if it needs a 3rd - you'll see.)
AS SOON as the green tick comes available, click on that. You must close the window designer before _ANY_ other clicks, after populating the control template.