terrain brush tool issues (can't see/change stoke settings)

So I have two projects, both in 2020.1.13f1. In one of them I can change the brush settings for terrain without issue, however in the other I have extremely limited settings.

The other was from a 2019 build that I updated, but even upon deleting the old terrain and making entirely new I am still stuck with limited settings.

Am I just missing something completely stupid here, or is this actually weird? My sincerest of thanks to anyone who can help me here.

The one on the left has the Terrain Tools package installed, you will need to install that if you want the additional brush support: Getting started with Terrain Tools | Terrain Tools | 3.0.2-preview.3 - Depending on the version of unity that you are applying it to, you may need to enable support for preview / experimental packages by opening the project settings, navigating to Package Manager, then enabling preview packages.