The tutorial I read is based on 2.79. So I'm not sure if it's still the same name in 2.8. But I can't find anything providing similar functionalities.
It can be found in the 3d Viewport:
As well as in the Edit menu where it is called Adjust Last Operation now, where you can also right click it and choose Assign Shortcut if you wanted to be able to call it with a keyboard shortcut like it was with F6 in previous versions:
Obviously, it does not need to be F6 and could be anything that is convenient to you.
protected by cegaton Jun 14 at 18:01
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?