TitleBar buttons are scaled very small at a resolution of 4K

[Case-Closed-X]

Description

WPF Gallery Preview close button doesn’t have corners, the close button will be displayed as shown in the picture at a resolution of 3840 * 2160.

Another issue is that the minimize, maximize, and close buttons are scaled very small at a resolution of 3840 * 2160.

Actual behavior

Expected behavior

Reproduction Steps

Launch WPF Gallery Preview and change the system resolution to 3840 * 2160.

Without using WPF Win11 theme issue

By the way, even without using Win11 theme (.net 9), the TitleBar buttons are still scaled very small at a resolution of 3840 * 2160 (both Win10 and Win11 systems). Can this problem be solved?

WPF Small buttons (Left) & WinUI 3 Normal buttons (Right):