Dang it. I have the same app version--but for some reason, I don't have anything beneath steps (like Floors and intensity minutes--which I do see when I look at YouTube video tutorials). #headscratcher
go to 'In focus', on the right side of the screen click on 'show all', then on 'change' [in blue] The tiles now show a minus in a red dot. Clicking on that will remove a tile Scroll down, at the bottom of the list you'll see an option "Add". Clicking on that will show you a list of statistics you could show, Intensity minutes should be there.
Couple of notes: I'm not looking at an English version, so wording may be slightly different You can delete from 'In focus' but it seems not add to it. You cannot rearrange the oder of the other activities shown. What I did was delete all but one from the other activities, then re-add them in the order I want them, then delete the first one. Cumbersome, but I have to scroll less now
