Panes

The floorplan and the 3D view: one of them, or both side by side.

Pane chip

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A small chip in the corner of each pane names it, Plan view or 3D view.

Pop out

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Opens a view in its own browser window for a second monitor, kept in step with this one.

Opening
The second button on the 3D pane's chip pops out the 3D view. The command palette can pop out the plan.
In step
Selection, level, view and edits follow between the windows.
Bring back
Closes the extra window. Keep it closed when you do not need it: each window draws the whole set again, which slows a modest computer.

Fit

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Frames the plan around everything on the level, and the 3D view around the whole set. On the Display tab, and on the 3D view's own bar.

Panes · Precollab docs