galaxy S9

For all I know this may mean something to S9 users - I've moved the thread to S9 for that reason - but it means nothing to me. Do you by any chance have Developer Options switched on?
 
How do I take off icon frames on Samsung Galaxy S9 ??? Please help!

If you are running Android version 9, you can't remove the frames (unless you change launchers and/or apply an icon pack.)

If you're still on Android 8, go to Settings, Display, Icon Frames. (You must still have Samsung Experience set as your launcher to change this setting.)