Infinity’ 25 introduced a way to configure the Full Case Page for a Case (prior it was only portals).
I believe this was a deliberate design decision, not to include tabs - simplified view was the intent.
You can’t configure this, so your only option would be to use a worker portal to consume the regular, less simplified, View.
Again, like your other question, I know there will be some new things in this space to give you more control over the full case page. I haven’t seen them yet, so can’t share, but I know they are adding more and more configuration options to full case page so you can tailor these kinds of requirements (not that it helps you now).