How to show access modifiers for classes in IntelliJ IDEA?
UPDATE
Since 2019.2 version you can enable it in the Project view options, toggle the Show Visibility Icons:
For older versions:
This option was disabled intentionally, see this comment for the explanation:
This information was intentionally removed, as we believe that it brings more clutter than actual value.
To enable it back add -Dide.projectView.show.visibility=true
in Help
| Edit Custom VM Options
.
Since 2019.2 there is actually an easy to use option as described in comment:
you can find this setting in options menu of Project Tool Window. It's called "Show Visibility Icons"