I noticed on Package Manager documentation that it is supposed to have a Built In Packages list that will allow me to see which Unity modules my project is using. I have been looking forward to this functionality because there have been a lot of unnecessary modules included in my WebGL build because some unused code somewhere referenced them. I intended to disable those modules and delete the dead code that is referencing them. However, when I installed Unity 2018.1 and opened Package Manager, there was no Built In Packages on the list. I thought that maybe I need to build my game first for them to appear, but even after the build there are no Built In Packages showing in Package Manager. What do I need to do to get them to show?