You can hide/show player group labels in each layout independently. For example, if you want to show player group labels for choirs in the full score layout but hide them in the vocal score layout.
Procedure
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Press Ctrl/Cmd-Shift-L to open Layout Options.
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In the Layouts list, select the layouts in which you want to hide/show player group labels.
By default, the layout currently open in the music area is selected when you open the dialog. You can select other layouts by using the selection options in the action bar, clicking and dragging across multiple layouts, Shift-clicking adjacent layouts, and Ctrl/Cmd-clicking individual layouts.
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In the category list, click Staves and Systems.
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In the Staff Labels section, activate/deactivate Show player group names.
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Click Apply, then Close.
Result
Player group labels are shown for player groups in the selected layouts when Show player group names is activated, and hidden when it is deactivated.