How to disable all at once?

@masato01 you can disable AMP by default using this filter:

add_filter( 'amp_post_status_default_enabled', '__return_false' );

@reneesoffice

Thank you for the answer.
Where should I apply this filter?

@masato01 You can apply it to the functions.php file of your active theme. You can then opt in for any particular posts, as opposed to the default opting out.

Or it can go into a custom plugin as well.

I did it as I expected.
Thanks to everyone!
Thank you!