Left Double Barline at Beginning of System.

[dstraigh]

I've recently used the following so that only the clef and key signature appear at the first system.

Document Options > Clefs > Display Clef Only on First Staff System

Document Options > Key Signatures > Display Key Signature Only on First Staff System

I've also enabled left barlines using:

Document Options > Barlines > Left Barlines: > check Display on Single Staves

But, I'm wondering if it is also possible to also enable double barlines on the left side of the system.

[motet]

From the Measure tool, select All, then double-click on any measure and pick Left Barline: Double. This will only affect barlines that begin a system.

[dstraigh]

Thank you @motet