Missing "Insert Layer" in VEGAS Pro 19.0

There is a “Insert Layer” in this video Boris FX Mocha 2022 - New Insert Module with PowerMesh Tracking - YouTube at 2:02.
But Vegas misses it.

Your insert layer will be Video 1, Video 2, or Video 3. It’s not missed so much as listed by track.

Can I insert multi layers meantime in VEGAS Pro? Or in Promiere? Thanks.

You can insert one insert layer per instance of Mocha Pro.