When you select the monitor you want to operate, PowerPoint displays two different display views: the default view, which is centered and at an angle, and an optional, third view. When you click the “Adjust…” buttons on either the front or back of the display (depending on what aspect ratio you want) and then hold the Control button to drag the display until you choose your preferred presentation monitor and size on either your PC or the projector. The default view is the default window size. It has the same size as the PC or the projector's screen. Use the control buttons and drag it until you get the same display size on each screen. A Note On Windows 8.1 Windows 8.1 and older versions of Windows have a more limited, smaller sized “standard” display area — much smaller and narrower, which makes it harder to get the same image size. You can check your window and desktop size and make sure your display size is set properly using the Edit Display Size window (Start | All Programs | Microsoft Office 2023 | Display | Edit Display Size). How to get an effective Viewer for a Dual Screen or Split Screen of a Presentation To make a dual screen or split screen useful, you have to make sure it's really two separate displays on each monitor. Here is how: 1. Click on the 'Screen Size' tab, and select Standard or Large. Note that Large won't appear on both monitors — it will appear on the primary monitor only (the one on which you're working). 2. In the 'Display' pane of the 'Viewer' pane, in the 'Presenter View' box, select your desired setup to create both a standard and double-sided monitor. 3. From the 'Viewer Layout' pane, select “Display Layout” or something similar to make sure the two screens are displaying two different screens, for example “2×2 and 2×1”. I personally find this very useful; in the “Setup” tabs on the right-hand side of the toolbar, I select “Dual Screen with Viewer Layout”. Don't be afraid to play around with this and make a dual screen more versatile for presentations. Some things to consider: 4. Make two windows on your secondary monitor that are similar in size.