You can hide/show secondary brackets for adjacent identical instruments in bracketed groups in each layout independently. You can also choose only to show secondary brackets when sub-bracketed groups contain at least two staves.
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 secondary brackets.
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 Brackets and Braces.
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Choose one of the following options for Instruments of the same kind within a bracketed group:
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Use secondary brackets
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No secondary brackets
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Choose one of the following options for When only one staff of sub-bracketed group is shown:
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Draw sub-bracket
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Do not draw sub-bracket
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Click Apply, then Close.
Result
Secondary brackets are shown in the selected layouts when you choose Use secondary brackets, and hidden when you choose No secondary brackets.
If you chose Use secondary brackets and Do not draw sub-bracket, secondary brackets are only shown when sub-bracketed groups contain at least two staves.
Tip
You can show sub-brackets from selected rhythmic positions onwards using custom bracket/brace groups, including in layouts where they are hidden by default.