Activity and location history disappear whenever you perform one of the operations below.
On your watch: Settings > System > Disconnect & reset
When you perform the operation below on your phone from a Wear OS by Google app.
Settings> (Select the name of the connected device)> Unpair from the watch.
When you uninstall the CASIO GSW SYSTEM watch app.
On your watch: Settings> Apps & notifications> App information> System apps> CASIO GSW SYSTEM> App info> Clear data
When watch memory becomes full, oldest history records are deleted as storage for new records is required.