There us is a bug in Unity Hub 2.4.4 which is causing the Rendering pipeline templates not to show when creating a new project.
The below instructions detail the workaround for importing the template into a new project.
- Create a new unity project as usual (or open an existing one)
- once open, in the Top Menu navigate to Window → Package Manager
- The Unity Package manager will open, from here click the triangle next to "Packages In Project" and change it to "Unity Registry"
- You can use the search to find the template you need (in this case "High Definition RP")
- Once you find your template, select it and click Install; this will take a few minutes.
- Once installed you may get a Window requiring you to fix certain settings on your project (specifically for HDRP), you can do this by clicking "Fix" on each issue.