The menu when we enter in game show have a button/option to hide all the UI elements . Like battle/missions/event/all that stuff so players can relax on main menu enjoying music and lobby background when afk.
It can also be toggled from menu to auto hide UI when afk which appears again when mouse movemnt or some input is given.
Its a qol but I want it and its somewhat there in preview for lobby backgrounds.
Please implement it.