Suddenly i see this bottom banner on mobile. What is this thing actually called in settings? How do i get rid of it? It only appears in some browsers, not in all of them.
AI-generated summary
The discussion revolves around the bottom banner appearing on mobile devices in certain browsers. physixfan initially asks how to remove it, describing it as not very useful. However, Jagster points out its usefulness as a toolbox for logging out, getting a URL, and navigating history. Don clarifies that the footer navigation is specific to iPhone DiscourseHub and PWA apps, and provides a custom CSS solution to hide it in a theme component. The solution involves adding the following code:
body:not(.footer-nav-ipad) .footer-nav {
display: none;
}
physixfan expresses gratitude for the solution.
Hopefully you can’t 
It is the only toolbox to logout, get an url or go back in history.
Well i don’t see it in most browsers, and i think it is not very useful.
Hello,
This footer navigation is only appears on iPhone DiscourseHub and PWA (without the arrow down button) app. It is useful eg.: if you added more site to the DiscourseHub app then you can close the site with the arrow down button and go back to the added sites list so you don’t have to close the app to switch between sites. The rest buttons performs clear action. There is also an iPad version the difference is, on iPad this footer nav is on the top.
You can hide it with adding this to a theme component 
Mobile / CSS
body:not(.footer-nav-ipad) .footer-nav {
display: none;
}
Great! Thank you very much!