Screen adjustment

[N67]

Hello,
My english is not terrible, sorry.

I installed Guest Additions 5.2.20.
Then, when I look at the display settings I have the choice between 2 resolutions (1024 x 768 or 800 x 600) but my problem is that the Windows window does not fit the screen and to work it is not obvious.
When I'm in full screen, the Windows window appears in the center of the screen with black sides (see screenshot attached).

Could you tell me how to solve this problem and display the Windows window on the whole screen?

I need help please.

Thank you.

Nicolas

[socratis]

We need to see a complete VBox.log, from a complete VM run:

• Start the VM from cold-boot (not from a paused or saved state) / Observe error / Shutdown the VM (force close it if you have to).
• With the VM completely shut down (not paused or saved), right-click on the VM in the VirtualBox Manager and select "Show Log".
• Save only the first "VBox.log", ZIP it and attach it to your response.

Instead of taking a picture with your phone, in a low resolution, distorted format, you can: 1) press HostKey+E (ToucheHôte+E) to take a screenshot of the guest, or 2) use the Preview.app and its "Take a screenshot" option. You then downsize your attached images by 50% (at least), or simply change the DPI to 72. Not everyone is blessed with a HiDPI display