When the scale has been set, the automatic detection could be run.
There is two ways to operate
The first approach - by category - is recommended since the detection of openings, slabs and rooms depends on the quality of the walls. If walls are missing or misplaced, some openings will also be missing or misplaced. The shape of rooms and slabs will also be uncorrect. For these reasons, it is highly recommended to run the wall detection and correct the geometry of walls at the end of detection before any further detection.
The detection of walls can be run by clicking on Walls elements step Detection button. A pop-up is opened to set the parameter of detection: