How do you zoom out when watching a replay?

Can you zoom out while watching a replay?

I know my question has been asked for playing the game and I understand that you can't. In another answer to that question it's claimed that:

...but you can unlock the camera while viewing replays.

However, linked article is from 2012, and involves a lot of console commands, whereas you often see casters zoom out on a whim. I think I started seeing that in 2013 or later, so it feels like a proper feature had been introduced to do so. A Steam Forum thread suggests the same (emphasis mine):

Question:
i was watching Ti4 playoffs and dota 2 casters zoomed out game from very high point of view how can i do that ingame ? i want to zoomout far

Reply:
Sure you can, you just need to spectate (or watch replays) in free camera mode and use the mousewheel to zoom in and out. I often do that when a teamfight is about to break out, I switch to free camera mode and zoom out a little...

However, I've tried this while watching one of my own replays, and it doesn't seem to work. What am I missing here?

Things I've tried:

• Changing the camera mode to all different options;
• Going through all of the Spectator key bindings;
• Meticulously go through all replay UI components to find an option for this;
• Double checking my scroll wheel is still working :D
• Searching with Google (last year's results) as well as Arqade;

No dice.

What are the current instructions for zooming out while watching a replay?