How to hide group so the other one takes all the space?

really need help as it is messing with me for hours now

I want to make it so after clicking a user (in the left repeating group) the group will close and the group with messages (the one on the right) will be full width, so full screen

I am doing it so when someone is on mobile, it is possible to see all people someone has chats with and after clicking to be able to see all the messages, something similar to facebook messanger

:confused:

hello everyone, any ideas? :frowning:

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