[HELP] Windows live messenger wont hide the toolbar

Hello , on my windows live messenger 8.5 , one day , he randomly decided to NEVER hide the toolbar , not even the button to hide it , i already tried to uninstall messenger , clear some caches (not all i suppose) , but it still won’t make the button reappear, what do i do?

OS : Windows 10
PS : I am french



is it problem?

msn emirhandincer@hotmail.com add me let’s help

… yes otherwise i won’t post this

well i think i will just… live with it