Hi i'm hoping someone can help with this one! We're quite new to Dynamics 365 Marketing and have noticed that when creating a Marketing Email, section elements are missing for some reason

We didn't notice it was missing until we saw this documentation https://docs.microsoft.com/en-us/dynamics365/marketing/design-digital-content - We can only see the 'Design elements' section
I was wondering if it was a permissions issue, but i'm System Administrator and i don't see it either, so am now wondering if it's some kind of configuration we're missing. I've tried all the built-in templates available (even a blank one) and we still don't see it
Can anyone help with what else to try to get it to appear please?
Thanks