Spotify - How to remove song recommendation from playlist shuffle.

 As a premium user, Spotify should not include recommended songs in your playlist. However, they had included a "Smart Shuffle"  which may show the following when you click on Shuffle

If you do not have the above screen, look for the "diamond" shuffle icon. If you see that, it means Smart Shuffle which will include recommendation to your playlist at shuffle mode.

To turn it off, click on the shuffle button and you will see "Smart Shuffle" recommendation removed message.

And, if you click the shuffle button again, it will have the normal shuffle icon, which does not include song recommendation.

The shuffle is used to toggle between normal shuffle and Smart Shuffle mode.