If the model has IfcGrid exported in it, you can click the grid dropdown.
You will be able to find the grid dropdown as the second dropdown on the top left of the 3D viewer.
Here you can:
Turn the grids for every storey on and off.
Expand the storey by clicking show grids.
Activate the grid plane
Create a section from a grid
Measure to grids, see how.
If you click on the annotation circle of a grid line a grid plane can be turned on and off.