Hi regalith,
You can create two types of the section, and set one type with a vertical section tail "M_Section Tail-Filled", and one type with a horizonal section tail "M_Section Tail-Filled Horizontal". See attachment "section tail.JPG".
If you want to switch between vertical,horizonal section tail in one section tail family, the you can open the M_Section Tail-Filled.rfa file, create family types, for example, type1 and type2, then create a horizonal filled region in this family, and set the horizonal filled region to be visibile in type2, and vertical filled region to be visible in type 1. Then load this family to the project, and then in the section tail list, it will show up "M_Section Tail-Filled: Type1" and "M_Section Tail-Filled: Type2".
Thanks.
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Lei Lan