The Sign on Save features provides a way to sign scripts right after they are saved using a configured code-signing certificate.
You can configure sign on save by enabling the feature in settings and providing a certificate path.
The path can be left empty and the extension will provide a quick pick drop down the first time you save a file.
Once you select a certificate, it will store that in the Sign On Save Certificate setting. You'll notice the setting is the full path to the certificate in the certificate store.
With the setting enabled, any time you save a file,
Set-AuthenticodeSignature will be called and your file will be signed.