How do you actually enable this to get used?

[jamesford42]

Could this perhaps be an "editor" so i can right click on a documents tab and "reopen with [tmpro]" or associate file extensions with it?

[Orange-Panda]

To use this extension:

1. Install and enable the extension from the extension marketplace
2. In Visual Studio Code verify that the extension is installed and enabled under the extensions tab
   a. You may need to reload Visual Studio Code for the extension to be enabled
3. Open the file that contains the TextMeshPro text
4. Set the language mode at the bottom right of the window to plaintext or markdown
   
5. The text should now display with the syntax highlighting.
   a. If it does not, an error has likely occurred somewhere and I'll need some information to resolve the issue

You may want to associate either of these languages with the file extension you are using. Here's a post elsewhere on how to accomplish this.