You can allow/disallow all chord diagrams project-wide to use thumb fingerings on the lowest string; for example, if your project includes chords that are impossible to finger without using the thumb.
Procedure
- Press Ctrl/Cmd-Shift-I to open Note Input Options.
- In the category list, click Chord Diagrams.
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In the Fingering subsection, choose one of the following options for Use of thumb when fingering lowest string:
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Allow thumb
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Disallow thumb
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- Activate/Deactivate Update existing chord diagram fingerings when changing use of thumb.
Result
Thumb fingerings on the lowest string are allowed/disallowed in all chord diagrams project-wide.
If you activated Update existing chord diagram fingerings when changing use of thumb, the fingerings and/or shapes of existing chord diagrams are changed where applicable.