Directories not showing?

Question

NetBeans

In an SBT (Scala) project, only the folder that refers to the "project" directory and the build.sbt file are displayed, and the rest are simply not displayed.
The same is true for other types of projects. It turns out that the list in NetBeans is formed on the basis of predefined rules and other directories in the root are simply ignored. Which in the case of SBT plugins does not allow you to see the necessary folders, although they (app, conf) should be there, and it’s not clear how the IDE needs a project with generated files.
How to make the environment display all the necessary folders and files in the Project tab (of course, they are displayed in Files, but there are also superfluous ones), although they are in the root of the project?