There used to be a "Back to Health Check" button if you left the main screen to see what updates were going to be applied. Now there does not appear to be a way to get back to the main Health Check screen.
Thanks for noticing that.
I've found that if you untick/retick any of the items then the 'Save and Back to Overview' button does come up so you can then carry on cleaning.
Why it's not showing without doing that must be a programming glitch, I've flagged it up to the staff and the developers are looking at it.