You were looking at old documentation (you link is of Entities @0.17), but the current version used in U6.2 is @1.3.1.4 (or 1.4.0-pre.4 if you go experimental). In the package docs link you'll find there's a version dropdown menu which takes you to the documentation of a newer version. Select the aforementioned version and you'll see the current package docs.

As for the package DOTS Editor, it's not needed and it's really old (2021 old). It basically tries to pull in a very early version of Entities. I looked into its functionality and it is basically integrated into Entities now (e.g. baking GameObjects into Entities).

At any rate, just remove the DOTS Editor and perhaps reinstall Entities 1.3.14 and you'll be fine.