How to create the 3D View (Dollhouse)?

You can freely navigate this 3D view:

Click “+ Add room” in the top-left corner, then you can select any of your added rooms in the current tour.

Select the room you want to add and click the “+ Add” button.

After you've added your room you can modify it by changing its parameters:

Switch between Move / Scale — you can edit size and position of the room manually with the mouse or input values in the side menu
Change the Level of each room
In the Panorama section you can modify the centerpoint of the room as well as the scale of the texture in each direction
Choose wall Visibility
Modify position and visibility of the Pointer

After changing all the parameters the result of the room is as follows:

Next you can:

Add next room — repeat the process described above. Next rooms will be added next to the first placed room; to switch between editing rooms double click on them.
Remove a room — removes the focused room.
Levels — change each Level name and height.
Settings — change action and visual options for the 3D view.

The settings you can change are as follows:

Zoom in (ms) — Zoom speed when switching from normal to 3D view
Zoom out (ms) — Zoom speed when switching from 3D to normal view
Point Color — Main — Color of the pointer circles inside the rooms
Point Color — Active — Color of the pointer circle of the active room
Background Color / Opacity — Background color and transparency
Autorotate Speed — Automatic rotational speed
Autorotate Inactivity (s) — After the set time the 3D view will rotate automatically
Room / Levels — Measures — Specify if meters or inches

After fixing all the rooms and settings the result will be this:

Don't forget to save your changes by clicking Save in the top-right corner.

Now you need to activate the view inside your tour.

Select Render Walk → Editor UI from the side menu.

Click on the 3D View icon and set Show as Visible.

Click Save on top right corner of the page.