@Emma Spencer  not sure about the footer height, I need to look into that but there's a section in Styling for the help center where you can add a content area under layouts and sections.  This might help you accomplish your goal!

Hope this helps!

Thanks @Nathan Sudds ,

What I was asking about was footer length - or the number of characters allowed in the footer. Currently it seems to be set to be very short. In Australia we always want to include an Acknowledgement of Country and we aren’t able to fit it in because the number of characters allowed in the footer is far too short