Please update the eWeLink app to the latest version and refer to the following steps to group the switches.
1.Tap on "All devices" and choose "Manage group".
2.Tap on "Add new group".
3.Name the group and choose the devices you want to put into a group, and tap on "OK" to save the settings.
4. You can see the group you creat and control the devices according to different groups.