Remove navigation on mobile

Hi – I am using a static front page and on desktop versions there is a black bar above the main image with “Welcome!”, but on mobile version it displays the mobile navigation menu (3 stacked horizontal bars) and “Welcome!” is displaying below the main image.

How can I remove the navigation menu on mobile and have “Welcome” displayed above the image?

Site is https://www.prayhungrysouls.com

Thank you!