the three buttons to close, exit full screen mode or minimize disappear

Does anyone know how it is possible that the three buttons to close, exit full screen mode or minimize the chrome window no longer appear when I am in full screen? I use a Mac M1. I updated the operating system and also Chrome to the latest version but the problem has not been solved. Can you help me?

If I am not in full screen they appear, when I am in full screen they disappear.