to reset chat window

first make a copy of your old ConfUser.ini
Then delete the ConfUser.ini from C:\Users\ ... \Documents\1C SoftClub\il-2 sturmovik cliffs of dover
Then disable stream cloud before starting up
Start up this will give a new Confuser.ini file,check to see then chat screen appears then shut down.
Added you control setting video setting from your old ConfUser.ini file
then restart game check that everything work as and if so restart steam cloud before shutting down the game and it will save the present settings