Add "Mega Menu" to SharePoint Site Navigation and Make it Available Across Site Collection
Add "Mega Menu" to SharePoint Site Navigation
Also, Create a set of templates. Ideally allow customisation of styles
Make it Available Across Site Collection
David Street commented
A single common mega menu that can appear across multiple site collections would be great, but it probably needs the ability to be scoped to specific sets of site collections.
For SPOnline if you only have one tenant (applies to about half our clients) and create Dev/UAT/Prod sets of site collections under that tenant, having different mega menus accessing different term sets that can be scoped to specific sets of site collections would make sense. Particularly for the ability to validate changes before they are applied to Production.
Andries den Haan commented
Great suggestion. This def. would work on the shared navigation from hub sites
Hassan Syed commented
We decided to address this limitation by developing a SharePoint plugin, FlyView for SharePoint, http://fly-view.com, it reads the site structure at runtime and expands with your mouse pointer movements, add in Chrome or IE and it will work automatically.
Something like the App Launcher of Office 365. The navigation between site collections or Web Apps should be available.