Change menu for only one page

hi
i have a menu for my page. everything is fine.
but when i open my “about” page (it opens in a new window and its a complete new page) there is my normal menu.
how can i shut it down on my “about”-page?

Hi,

Please go to: Appearance > menu.
Make sure the “Open link in a newtab” option (http://prntscr.com/dwlb2s) are not ticked.

Regards,
Awan