There are two ways to organize your channels:
Group channels by assigning channels to Categories
1. Go to Channels, click the channel's 3 dot icon and click Assign to category.
2. Select the category from the list and Click Save to apply changes
Re-arrange your channels on the categories
1. Go to Categories tab, click the channel's 3 dot icon and click Edit option.
2. Use these icons to drag and re-arrange the channels on this specific category.