Thanks for posting and welcome to the Community!
We're not sure if we understand correctly the situation you're facing, so it would be nice if you can share some more info. Maybe a screenshot could help us advise you better.
Keep in mind that the Autoplay feature is not connected with the recommendations that we're suggesting for your playlists. Toggling it on or off allows or disallows Spotify to continue streaming similar songs after your playlist has ended and you can read more about it here.
If you're having in mind the recommended songs that appear at the bottom of your playlists, we can confirm that this is expected behavior and that this feature is currently not removable. However no songs should be added to your playlists without your consent. If the suggestions do not appeal to your teste you can always use the refresh button to load a different set of recommended songs.
Hope you find this useful. Keep us posted if you have any questions.
Help others find this answer and click "Accept as Solution".
If you appreciate an answer, maybe give it a Like.