Windows 11 24H2 has an undocumented bug that could change the default size of the cursor when you resume the desktop from ...

You can make the mouse pointer red or solid black in Windows 11/10. Change Mouse Pointer & Cursor size, thickness & the Pointer & Cursor colors.

If the mouse cursor change won’t stay permanent in Windows 11/10 PC, you have to create a custom scheme. Here is a complete tutorial on this.