Full page isn't scrolling on smaller screens when using floating groups for menu

Hey all,

So, I have a web app, as follows:

Top menu = floating group with nav menu within it.
Left menu = floating group with left hand nav menu within it.

This on a large screen works perfectly, the content on the page scrolls but the top nav and left nav menu’s stay sticky.

What I’ve just noticed when on a smaller screen is that I’m not seeing the whole left hand menu and it’s not scrolling - only the page content is scrolling. If i set the left floating group to both on the floating setting then that scrolls independently too.

Any suggestions?

Bump! Any help please!