The File menu
Reload
If you make changes to a system and then change your mind, you can use File > Reload to recover the system in the state when it was last saved.
Source: https://docs.sw.siemens.com/en-US/doc/254352342/PL20250521841123434.amesim_collection.Reference_Run/Reload_saved_version · retrieved 2026-07-17