Hi Zidu, Martin,
Thank you for reaching out to the Microsoft Q&A platform.
Based on your question description we understand that you are facing an issue with display issues in Azure Virtual Desktop (AVD) RemoteApp.
Here are a few steps you can try to resolve the issue:Please check that the display settings in your AVD host pool are configured correctly. Settings like smart sizing and dynamic resolution.
Set "Use Advanced RemoteFX Graphics for RemoteApp" to Disabled.
Try using keyboard shortcuts like Shift + Right Click on the taskbar icon of the application and selecting Restore or using Windows Key + Arrow Key to move the window.
Make sure you are using the latest version of the AVD client. please find the below document link for your reference:
Also, recommend you please go through the below similar issue article for more information:
If it was helpful, please click "Upvote" on this post to let us know.
Thank You.