youtube.com/watch?v=ircl1OVEdaM at 15:37 isn't mentioned how to enable this.
(Please don't prefix post titles. "Unknown" isn't useful as a prefix, and "Bug" or "Feature Request" are often misleading as well, as things people think are one are often the other, or neither and just a question about how to use things.)
For alternating row styles, you already asked this and got an answer here. (This seems to happen a lot.)