The title is pretty self explanatory, you can't stop songs from coming up in daily mixes. While I do understand that there is a "hide this song" feature on mobile to prevent a particular song coming up, it still does come up in the playlist (and sometimes still plays??) and if you use another device with the same account, say your PC, it will still show up and (because the PC app is so neglected and NEVER receives any updates) there's absolutely no ability to remove that song.
My suggestion, as many many others have suggested on this community section, is, when you select "hide this song" perhaps that means it does exactly that. Doesn't come up in the playlist anymore. It's wasted space to keep it there when you could put in another song that IS actually good. Not to mention adding the feature to PC at all is a solution too. I have seen your moderators & community people suggest to not see that artist, this is NOT a help, as my issue (and many others) lies with one song only. The rest of the artists music is good.