1. Where is the option to turn these on in 5.5?
2. Would you use these for a project intended for web delivery? Is it necessary for video on the web?
The Title Safe, and Action Safe areas are basically for older, CRT TV's, though there are still many HD TV's, that do not show 100% of the raster. For the Web, you should be just fine to go, without those considerations.
...and they are turned on by an icon under each monitor