Hi ! Usually, these id are generated by the web browser at the loading of the webpage. You can't make these id generic without modifying the app/website itself.
Instead, you could use the contains method of xpath. > //div[@role='main']/form[contains(@id, 'form_')]/div/div/div/div/button[@name='SystemDefinedSaveButton']
If you have multiple forms in your webpage, try to find a unique value inside the form you are looking then build your xpath from this point.
Example : //div[contains(@title, 'My Form Title')]//ancestor::form/div/div/div/div/button[@name='SystemDefinedSaveButton']