Resolution, letter size and interface changed due to new 4K monitor

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Picture of my Teamspeak overlay right now (http://ift.tt/2dDTehA) Hello guys and already thank you for viewing this thread. I have bought a 28" UHD (4K monitor) yesterday and everything works perfectly exept my teamspeak overlay. Before using my 4K monitor I have used a 1920x1080 21.5"... Resolution, letter size and interface changed due to new 4K monitor