I like human understandable
characters myself. So I typically rock a completely empty Preserve Entities list. Which means I don't have to see a single entity (named, numeric or hex)* in Code View, but hey!... whatever floats your boat.
* Yes, I know characters like & and < and > would still require the use of entities in Code View, but those entities are always preserved without listing them. So please -- in the name of all that's holy -- never
ever enter any of those 3 particular entities in the Preserve Entities list!! In fact, I need to remember to modify Sigil to ignore those entities if someone mistakenly adds them to the Preserve Entities list.