To change Channel Settings deactivate the desired Channel(s) by unchecking the corresponding checkbox(es).

Deactivating a Channel will make it unavailable in connected just:in User Interfaces.

Basic Channel Settings

Settings:

Please beware that this option is enabled by default, when using an AJA device as input source. This can not be changed.

Preview Settings:

(Re-)Enabling a Channel

After changing the settings of a Channel you need to enable it again by clicking on the corresponding checkbox. You can only activate Channels with valid Video Modes.