Site Name for Mobile and Desktop

Site Name can be added in the back-end console under Theme Settings >> Global Settings.

For mobile it will appear on top bar. Make sure it is not too long or it will be cropped out. If the site name is left blank, there will be nothing here.

For desktop it will appear on browser’s tab. If the site name is left blank, it will show website link instead.
Site Description and Site Keywords are not the design but SEO.