Change the orientation in your OS Display Settings and ensure your stand supports physical rotation. Use vDisplay Manager for automatic switching.
1. Physical Adjustment: Tilt the screen back and raise the stand to its maximum height before rotating 90 degrees clockwise.
2. Windows 10/11 Setup:
Right-click on the desktop and select [Display settings].
Locate the "Display orientation" dropdown.
Select [Portrait] or [Landscape].

3. macOS Setup:
Go to [System Settings] > [Displays].
Find the "Rotation" option and select [90°].
4. Smart Solution: Download ViewSonic vDisplay Manager. Enable the [Auto Pivot] feature to have the OS orientation change automatically when you rotate the hardware.
Note:
Warning: Do not force the screen to rotate if the stand does not support it. Check if your model has a "Pivot" feature in the user manual.