Mobile view is terrible and there is no way to fix it, or rather, if you fix mobile view then desktop matches mobile which obviously doesn't work. I've tried everything from reducing font size + images, inserting liquid CSS, talking to Assistance - nothing! Unless there will be an update soon I will have to consider an alternative theme or platform.

There is no way to stop Mirroring desktop to mobile sizing and fonts. If you change the desktop it changes the mobile and vice versa. There should be a setting to override within the Theme settings, wasting time trying to figure out code.

If we could have more mobile custom that would be great

Does the Horizon theme not include a mega menu feature? Why, then, does the description state that it does?