Cut to black at end of web video

At the end of a Youtube video the main outputs show their promotion of other videos, which is not helpful here.

Strangely the Main Audience Output preview in the app just shows black, and does not match what is being sent to the screens.

Could the main screens also be either held on the last frame or cut to black?

YouTube videos will cut to black starting in version 2023.1. Thanks for the suggestion!