Hi Sarah Williams,
Modern Windows versions store your Start Menu layout in a file named start.bin. You can find this file by pressing the Windows Key + R, typing %localappdata%\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\LocalState into the Run box, and pressing Enter.
To attempt a recovery, right-click either the start.bin file or the LocalState folder, select Properties, and open the Previous Versions tab. If Windows captured a restore point or shadow copy prior to the forced reboot, select that date and click Restore to recover your layout.
If no previous versions are listed, Windows does not keep an alternate automated backup, meaning the layout cannot be recovered and must be rebuilt. Moving forward, you can manually copy and save a backup of this start.bin file to another directory so you can easily paste it back if the layout vanishes again.
VPHAN