How to fully clean, re-resolve and rebuild a Scala sbt-managed project in IDEA?

Question

TL;DR: How can I fully reconcile all dependencies in IntelliJ when SBT file changes

I have a SBT project setup in IntelliJ. For the most part if works l

Answer 1

What worked for me was to:

1) Close IntelliJ

2) delete .idea/libraries internals

3) Start IntelliJ

4) right-clicked pom.xml Maven > Reimport

After that there were no old versions and duplicate libraries in the External Libraries.