GREAT PLANES RealFlight 7 User Manual page 249

MultiMode will split the screen either horizontally (default) or vertically. You can
change this option in the Settings window. Simply click the Simulation menu
followed by Settings. On the left side of the Settings screen that appears, choose
Multiplayer. On the right, you can adjust the MultiMode Screen Layout – select
either Horizontal or Vertical.
All options available in RealFlight are also available in MultiMode. The difference is
most will function on half of the screen that currently is active. To determine which
half has the focus or is active, look for the yellow outline. To change focus, click the
half that doesn't have the yellow outline. You'll notice the focus changes when you do.
For example, if you are flying in MultiMode with a horizontally split screen, you might
notice that the yellow outline is around the top half. If you want to change the aircraft
for the person flying on the bottom half of the screen, first click that half of the
window, so it has the focus or is the active screen. Next, select an aircraft following the
normal procedure.
To exit MultiMode, select Exit MultiMode menu item under the Multiplayer main
menu.
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