Mateusz P. yeah modifying the breakpoints for the webflow navbar can be very tricky. In most cases it requires custom code.
In other cases, you'd have to turn on the menu on desktop and style all of the menu button and menu options for desktop or you could swap out your navbar for a navbar that is already setup for desktop breakpoint.
Its pretty rarely worth all the effort though and its usually better to try to adjust the sizes of the nav items (both font size and actual text length), adjust the logo size (or have a smaller version of the logo, or to change the orientation of the logo and navbar to give the navbar more room. There's a lot of other options out there than to try to go the most complicated route of changing the breakpoint for the navbar menu.