Edit boundaries: Click the ⚪ control points on the time map, then drag any ball in the space view to set its position. View solution: Hover over blank areas of the time map; the space view will show the solved state at that time (visible even during solving).
Space view (control points shown when editing)
Time map · Click ⚪ to edit | Hover to inspect
Click a ⚪ control point on the time map to start editing.