While creating a WordPress Full Site Editing theme, you may need to change the breakpoint of the Gutenberg navigation block.
The following CSS will achieve just this.
body .wp-block-navigation__responsive-container-open:not(.always-shown) {
display: block !important;
}
body .wp-block-navigation__responsive-container:not(.hidden-by-default):not(.is-menu-open) {
display: none !important;
}
@media (min-width: 884px) {
body .wp-block-navigation__responsive-container-open:not(.always-shown) {
display: none !important;;
}
body .wp-block-navigation__responsive-container:not(.hidden-by-default):not(.is-menu-open) {
display: block !important;
}
}
Change the @media (min-width: 884px) to whatever breakpoint you require.