Terrain tools and other packages not visible in Package Manager Unity 2021.1.0f1

I was going to import the terrain tools package to my project, but no matter what I do it won’t show up in the package manager list. I can still create terrain, but I have no access to the terrrain toolbox window, or the features that come with it.

I believe there are other preview packages that are missing as well, despite being having Pre-release packages enabled, ad refreshing several times. Any help?

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Same issue here, I wonder if it hasn’t been updated or something, anyway, huge bummer as I can’t work on my project without it.

Edit: I found a solution in another post