No Portrait Mode when editing in Photos
I'm editing a photo taken in portrait mode on my iPhone 13 Mini and I'm following the instructions on this Apple page: https://support.apple.com/en-au/guide/photos/phta3a9f5c61/6.0/mac/11.0
I've set the drop-down at the top of the page to macOS Big Sur and it says:
Select a lighting effect.
If the lighting effects appear dimmed, click Portrait under the photo to turn them on.
In Photos 6.0 on my MacBook Pro running macOS 11.6.1 the photo shows "PORTRAIT" in the top left corner, but in edit mode, with "Adjust" selected, the photo has only the same editing options as a non-portrait photo. There is nowhere to choose a lighting effect and "Portrait" does not appear under the photo.
What am I missing?
MacBook Pro 16″, macOS 11.6