Android - Has the setting to disable icon frames been removed on the Galaxy S10 lineup?
This seems to be a setting that started in Oreo related to Adaptive Icons. You now need specific themes to remove the border.
Per the following link:
If you don't want borders, go to settings>wallpaper and themes>icons>download and find an icon pack with no borders.
https://androidforums.com/threads/why-is-there-no-option-to-remove-icon-frame-borders-on-the-new-android-pie-update.1295501/
I read from many posts that the option shown above has been removed. Only solution I found is to download an icons set that was made without frames feature. I am using one called Zero made by MINU after seeing its link in another post about the same issue on this website.