Adjust header in mobile

I have an issue with the header size in mobile view. My site: https://www.bcsportsfoundation.com (which in in maintenance mode). I can send you login info if you'd like.

I tried adjusting the width to 15px in the Customizer...however, the setting was already at 10px when I opened the menu. I read a couple of forum items but they do not speak to my issue.

Can you take a look at the site in mobile view and advise me. I'm trying to get this right so I can launch the site.

OH....does the header support a slide like the Elementor Image Carousel? I would like to be able to add links in the slider...

Thanks