While in walk mode, you can maintain control over a piece by snapping it.
When you snap a piece to a point, a grid, or a guideline during the walk, there is a short pause so you can adjust the piece (by adding a notch, mirroring a piece, or making other adjustments) in its snapped location.
To snap a piece:
In the 2D window, right-click the piece.
On the Horizontal context menu, go to Snap to.
Select where to snap the piece.
When you slide the pivot point:
Snap to Edge and Slide statuses are ignored.
Snapping is limited to Snap to Point and Snap to Grid statuses.
The following image shows this feature in action.