These cases happen in some games such as Valorant, while players choose “Scaling by Display” in their graphics card control panel. Since the monitor is a passive device, it passively receives the signal output from a graphics card (which also needs to cooperate with the software). Compatibility issues from games and graphics might also cause the issue.
Suggest to try the following steps:
1. Update your graphic card drivers to the latest version.
2. Run your graphic card control panel applications:
- For NVIDIA's graphic card:
1. Select "Adjust desktop size and position" under the "Display" section
on the left taskbar.
2. Select "Perform scaling on:" by "GPU"
*Note: you can select a scaling mode like Aspect ratio / Full-screen /
No scaling to adjust.