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

You can configure the improrts in the Settings.

Project Settings
Code
Scala Imports

Class count to use import with '_' - in this text field, specify the number of classes to be imported from a single package until all statements importing a single class are substituted with a statement importing an entire package.

Add import statement in closest block - select this check box to add your import statement to the closest block instead of the top of your code.

Add fully qualified imports

Sort imports lexicographically (for optimize imports) - use this check box if you want IntelliJ IDEA to sort your imports in lexicographical order. However, if Add fully qualified imports check box is selected then

Collect imports with the same prefix into one import - use this check box if you want IntelliJ IDEA to insert all imports with the same prefix into one. 

Import members using '_' - select this check box to import all members of the package (this is analogous to import members using'*' in Java)

Use the shortest path when trying to import reference with already imported name

Classes to use only with prefix - this area lets you view the list of classes with prefixes. You can add a pattern to use appropriate classes only with prefix or you can remove a class from the list.

Import Layout - this area lets you view the layout of the import statements, add or remove blank lines between them, and add package names.

IDE Settings
Editor
Auto Import

 You can select the following opions: