“Virtual hard disk size” field ignores typed input in VHDX mode

[bacevs]

When Installation mode = VHDX, the Virtual hard disk size numeric field does not accept keyboard input. The value can only be changed using the spinner arrows or by pasting a number. This makes large adjustments (e.g., from 2 TB default down to 500 GB) slow and frustrating.



Steps to Reproduce

1. Launch WinToUSB Professional.
   
2. Select a Windows 11 ISO and edition.
   
3. Choose a destination disk.
   
4. Set Partition scheme = GPT for UEFI and Installation mode = VHDX.
   
5. Click into Virtual hard disk size and attempt to type 500.
   

Actual Result

• Keystrokes are ignored; the number does not change.
  
• Only the up/down spinner arrows change the value.