Auto-save is a Power App system administrator setting that helps users focus on their work without having to manage saving data in the form.
By default all main forms for Updated tables and classic tables will have auto-save enabled and it's best practice to keep it enabled.
After a row is created (initially saved), any changes made to a form will automatically be saved thirty seconds after the change is made.
If no changes are made in the form, the automatic save won't occur while the form is open. After a change is made, the 30-second period before an auto-save begins again.
If someone else has updated the same row while you're editing it, those changes will be retrieved and displayed in the form when auto-save occurs.
Navigate to the Power Platform admin center then Environments > Select your environment > Settings > Behavior