IntelliJ IDEA lets you manage your imports in Scala the same way as it does for other languages.

You can configure the imports in the Project Settings and in the IDE Setting.

1.Project Settings

Project Settings
Scala Imports

2.IDE Settings

You also can configure the behavior of the imports in the editor through the IDE Settings.

IDE Settings
Auto Import

 You can select the following options:

3.Optimizing Imports

You can optimize imports using Code Optimize imports command.