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Change the aspect ratio of a layout in MainStage
You can change the aspect ratio of a concert layout. Changing the aspect ratio lets you use the concert with different monitor types: 16:10 (widescreen), 4:3 (standard), and 10:16 (portrait).
Change the aspect ratio for a layout
Choose Aspect Ratio from the workspace Action pop-up menu
, then choose an option from the submenu.