Inactive has a new system setting so it is enabled automatically.  It is on automatically.
Prior to this change, Inactive was a feature set you would enable when you were ready.  These setttings still work perfectly; just the System Setting has changed to be enabled.
Inactive shows the Inactive checkbox, lets you Add(+) the Inactive column in Searches,  click to toggle, requires Inactive privilege on Employee Access, or can be Disabled, too.