I got my a10s updated to one UI 4 android 11 but the app drawer become grey and it's not good as it was before the update especially when you turn the dark mode on it gets uglier.. I hope it will be solved in the next update
Do you have access to the Theme Park app by Samsung? It allows you to change the theme based on the color range of a wallpaper of your choice which then also allows changes to system colors including the app drawer. I'm just not sure which devices it supports because it seems that is always changing.