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Forms can be specified to apply to only specific root-directories. Click on the “Form accessibility” button in the forms meta-data view:
You now see a roster that displays all the available root-directories along the X-axis, along with all available forms on the Y-access.
Check the form/root combinations that you want to make exclusive, and press the save button in the top-right corner to apply the changes.
When no restrictions are set, the form is available for all root-directories (as is the case with the “BM trephine” form in the screenshot).