You can hide/show instrument change labels at the start of each flow in each layout independently. These labels can be useful for players holding multiple instruments as a way of clarifying the instrument required in their part layouts, which do not normally show staff labels.
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 instrument change labels at the start of flows.
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 Players.
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In the Instrument Changes section, activate/deactivate Show instrument change label at start of flow.
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Click Apply, then Close.