Home » Tip of The Day » Fit On ScreenFit On Screen October 16, 2015. Posted in: Tip Of The Day. To fit the selected layer or object on screen, press Ctrl 0 (zero) or Command 0 on the Mac. This works great when transforming a layer whose bounding box is outside the canvas. « Previous Photoshop Tip: | Next Photoshop Tip: » Sign-up for the PTC Newsletter so that you'll never miss a tutorial!. Your Email Address: