Don't show available dial slots when screen is full

As dials are added to a tab, the software ensures that there are always slots available to add new dials.  This works great until the last dial on a fully maximized screen is shown, and then it adds a whole line of empty dials that are partially visible and a scroll bar.  They way I work, I would rather user a tab until it is full and then switch to another tab for more dials rather than add dials to the same page with a scroll bar.  The only way I can facilitate this currently is to leave the last dial always empty.