Black Areas in Guest OS

[dbelal]

Hello,
I just installed Win10 in a VirtualBox VM. Some parts of the Window are overlayed by black areas which limit the usability of the VM. I will attach a screenshot.
I assume this is a easy to fix problem; however I dont know how to tackle this.

Please help me to get rid of the black areas.

Host OS is Archlinux 5.4.7-arch1-1
Guest OS is Windows 10 Home
VirtualBox Version: 6.1.0 r135406