Menu fills page height settings doesn't work

Good day everybody.

I faced a problem with the mobile header that is created using navbar. I’m working on the tablet and mobile versions and intending to make the nav menu full page when it is opened and the layout under the navmenu should be scrollable. But the thing is that the burger menu settings “Menu fills page height” and “Disable scroll offset when fixed” aren’t applied to my layout when I set it up.

What might be the problem?

Thank you in advance for you help!


Here is my site Read-Only: [LINK][1]

Don’t understand why editor mode displaying is different from the preview mode.

Editor mode nav menu:

Preview mode nav menu:

In preview mode the navmenu is opened lower than it is supposed to be opened…