To enter the parameters of a room, click on the pencil :
You will then see a green frame around your plan and the name of the room you are in, this is the room configurator. To exit, just click on the house with the arrow inside it (circled in red below):
What is the purpose of the parts configurator?
Once in this mode, the vertical menu will be reduced.
In the example, we are in the "living/dining room" configurator, in "build", we will find only the elements appropriate to this room:
In the same way, the "furnish" menu will be lightened:
If we take the "bathroom" configurator, we will have all the essential elements in a bathroom:
And so on for all the rooms, so you'll find what you're looking for more quickly whether it's in 2D or 3D!