I have applied a filter where Category Name is Rooms, and I can see the rooms in the Grid, but I do not see any geometry in the Viewer.
By default, Rooms are automatically filtered from the inventory and viewer.
To make them visible:
1. Click on the Visibility Settings link.
2. Click on the ignored categories.
3. Uncheck Rooms and update the Settings.
4. Modify the newly created rule to SHOW ONLY Rooms.