The following options are available for tuning the autosave behavior
File >> Settings >> Appearance and Behavior >> System Settings
PyCharm Edu >> Preferences >> Appearance and Behavior >> System Settings:
Save files on frame deactivation (i.e. on switching from PyCharm Edu to a different application).
Save files automatically if application is idle for N seconds.
Note that those are optional autosave triggers, and you cannot turn off autosave completely.