Do not want Volume key by default control Spotify music

[JiaWoei]

Volume key by default control Spotify music playing in my speaker at home. Although I have something else playing on my phone, when I want adjust the volume of media playing on my screen, it suddenly adjust the volume of Spotify. Is there any setting can force the volume key only control the media currently playing? I remember my old note 10 can do this. 

[nazzzz]

are u referring to this? ?

press vol button -> click the 3 dots -> settings