Function "Assigning channel to a group" is necessary, when you need the message requests from specific channels to get to specific operator groups.
you need to set up omnichannel customer support for several projects and for each of the projects you have a specific operator group
you need to set up multilingual customer support (one operator group - Europe, the other operator group - China) and for each of the regions you want to have specific channels
Select the groups which you need to assign to the account of the channel.
Tick the box in front of "Assign closed conversations to chosen groups" and specify the minimum amount of time (in hours), which should pass before the new message requests from the assigned channel gets into the Default group.
Select the groups that need to be assigned to the specific channel.
Open "Settings" tab, after click on "Auto assign messages" tab and activate the function.
Click on "Save"