Dashed ossia barlines in piano quartet SCORE

In Engrave mode:
Click on the Violin ossia staff, Ctrl/Cmd-click on the Cello staff, click on Change Barline Joins
Change Barline Joins

Click on the Violin ossia staff, Ctrl/Cmd-click on the Violin (non-ossia) staff, click on Change Barline Joins.
If you have Join with dashed barline selected (and applied) in Engraving options > Barlines > Ossias, it should appear like this.

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