Origin automatically saves each workpiece you create. This allows you to move from project to project without losing your work.
To return to a previously-scanned workpiece, go to Scan mode and tap Workspaces. You will then see all workpieces currently stored in your user profile.
Any workpiece that was saved with the tape array that is currently visible to Origin will appear at full brightness. You can return to one of these by tapping its icon.
If a workpiece was saved with a tape array that Origin cannot currently see, it will be greyed out. You can still select this workpiece but will need to aim Origin at the tape you originally used for that project before the workpiece file will appear in your workspace.