tvign

The setting works only for the Windows 7 Style start menu. If you select the Windows 10 Style, the start menu always pops up in Monitor #1 regardless of which start button is clicked. The only way to get Window 10 Style to work with 2 monitors is to uninstall Start10, which I did. Now everything is back to normal.

Wndows 10 start menu shows on the display that you are using. Start10 shows only on display #1.