Spotify's algorithm benefits from user input, with the Minus button hiding disliked songs. Historically, the UI design has been inconsistent with the placement of Plus and Minus buttons. New ...

Plus and Minus You'll notice that your Instant Pot has a Plus and Minus button in the very center. These are probably the most used keys, as you'll see below.

Spotify’s replacing its heart icon with a “plus” button that lets you save songs to your library and add them to a specific playlist. It’s rolling out globally on iOS and Android.

By default, the menu displays six icons, but you can use the plus and minus buttons on the bottom to increase or decrease that number. You can always tap Reset to revert to the default number.