If the model has IfcGrid exported in it, you can click the grid button
next to the revision selector.
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.
