Hide menu on a single page - mobile version

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Dears, I have been trying several way to hide the menu on this webpage in the mobile version: https://www.densityaroundvoid.org/mussonaro/

At the moment I managed to hide it from the desktop version with the custom CSS

body.type-page.id-131 nav.primary{
display: none!important;
}

But I did not find a way to hide it from the mobile version. Even hiding it from the theme customizer area does not work.

Any hint highly appreciated!

[arminunruh]

in customize → mobile → mobile menu

there is a hide option
it should work :O

on your website i see no menu