No elevation tab in ArcGIS Pro 3D local scene map properties?

[JenniferScoular]

I'm having a problem viewing topography in ArcGIS Pro 3D local scene. I have managed to get buildings 3D but I cannot seem to get a 3D basemap (ie with hills etc). I was following the instructions from DigiMap using their OS Terrain 5 DTM, which I imported using Add Present>Ground and selecting the asc file. However, when I go on map properties for the 3D map, I have no 'Elevation' tab. Does anyone know why this is? 

I created the local scene using the convert tool.

Thanks

[RussRoberts]

Hey Jennifer, You'll notice in your screenshot there is a section in the TOC called Elevation Surfaces. Click on the text Ground and you will see the elevation tab appear.