15b5 Buggy Fullscreen Mode in Color Page

Hello,
Using the Fullsceen Hotkeys "Ctrl+F" in combination with Playback causes some strange outcomes on my Resolve Studio 15b5.
1. Starting a Playback on the Color Page. Then hit "Ctrl+F".
Outcome: No Fullscreen. Instead some knd of hybrid Mode mode where some of the Fullscreen UI pops up but the canvas size stays almost the same
2. First hit "Ctrl+F" on the Color Page then start Playback. And then wihle playback is taking place hit "Ctrl+F" repeatly.
Outcome: Stuck in the Fullscreen mode and the Playback goes on. Only the task manager is helping by this time to get me out of the fullscreen in playback mode.
I tested it on my PC. I am using 3Monitors for working. It happend on "dual Screen = on" and ""off mode.
Using the Fullsceen Hotkeys "Ctrl+F" in combination with Playback causes some strange outcomes on my Resolve Studio 15b5.
1. Starting a Playback on the Color Page. Then hit "Ctrl+F".
Outcome: No Fullscreen. Instead some knd of hybrid Mode mode where some of the Fullscreen UI pops up but the canvas size stays almost the same
2. First hit "Ctrl+F" on the Color Page then start Playback. And then wihle playback is taking place hit "Ctrl+F" repeatly.
Outcome: Stuck in the Fullscreen mode and the Playback goes on. Only the task manager is helping by this time to get me out of the fullscreen in playback mode.
I tested it on my PC. I am using 3Monitors for working. It happend on "dual Screen = on" and ""off mode.