[Garkin]

Originally Posted by Ayantir I'm already working on this. I prehook SCENE_MANAGER:SetState() and use CHAT_SYSTEM:Minimize() and :Maximize() for my part. Just need to disable it at 1st state (when addon loads) and check if scene manager is on "hudui" or not.

Usually everything, what you want to do when scene is showing or hiding, is done by registering to StateChange callback, something like:

local function OnStateChange(oldState, newState)
    if newState == SCENE_SHOWING then
        CHAT_SYSTEM:Minimize()
    elseif newState == SCENE_HIDDEN then
        CHAT_SYSTEM:Maximize()
    end
end
 
local scene = SCENE_MANAGER:GetScene("bank")
scene:RegisterCallback("StateChange", OnStateChange)

But if it works, do it as you like.