CTRL+ or CTRL- are more browser related, not so much relevant to FTM.
A few thoughts -
are you working on a computer (perhaps a laptop) that has AT SOME TIME IN THE PAST been connected to an external monitor. The setup perhaps is still set up to "think" there is a 2nd monitor.
Have you possibly adjusted your display settings on the control panel, to something other than 100%? At one time, I had done so and could not see the "options" on the FTM dashboard (righthand panel). I switched to wearing my reading glasses, instead of making the display changes on my computer.