How to remove and block “Visual Studio 2026 Fluent UI”

I don’t like the changes that were in the “fluent UI refresh” for VS2022, and I still don’t like them in VS2026 and want to go back to how they used to be (disabled). The thing I want to undo looks like this:

The thing I had before, and want to go back to looks like this:

How can I remove and permanently block this change?

PS I wanted to tag this visual-studio-2026 but was not an option