We have a conference configured on the MCU and have made it permanent and selected a pre-configured list of participants. While the conference is active we can change the layout of each participant under
I don't believe you can change it for a specic conference, but you can change the settings for your pre-configured participant.
On the MCUs web interface, if you go to Endpoints, then select one of your pre-configured endpoints, you can change the "Default View Family", "Default video to use", etc. This is where you can also set them as a Guest, and enable the automatic disconnection ability.
We've done this for a number of devices to force them to a specific view and to which other pre-configured endpoint they see.
It's not as flexible as what you can achieve while the call is active, but may help to assist you getting part way.to achieving what you're after.
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Wayne -- Please remember to mark helpful responses and to set your question as answered if appropriate.