Hello,
I’m new to Gladys,
Have you correctly created all your rooms?
Have you assigned the devices to the room in the Zigbee2mqtt integration?
When editing the dashboard, you need to choose « Room devices » and select the desired room.
You will then have all the devices linked to that room.
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Thank you for the remark, I hadn’t seen during the installation where you had to create rooms. If the location had been clearly indicated, I wouldn’t have missed the « next » steps for creating rooms.
See you soon with other questions 
This is one of the first things to do during installation.
You can do it later by going to the settings and clicking your name in the top right.