In the Composition Mode, in both views (360 and 3D), you have access to the “zoom in / zoom out” feature.
This feature enables you to change the focal distance. By modifying the focal distance, you can adjust with more precision the position of the elements on the scene.
Note that changing the focal distance has no effect on the final rendering of the experience. This feature is only designed to facilitate the production of your experience.
In order to use this feature in static view, click on the tiny bar, hold it then drag it either upward or downward. You can use your mouse wheel as well, and scroll up or down.
3D view also allows you to use the focal length function, just like static/306° view does.
Warning : In 3D view, using the mouse wheel does not change the focal length. Instead, it allows you to move the camera within the scene.