If it helps someone else heres the answer to my question:
If you go to Analyze -> Inspect Code…
When your project has been inspected click on Code maturity issues and tada, there is a list of all Deprecated API usages 🙂
UPDATE: May 2021
Deprecation warnings are now found under your respective language.
Kotlin -> Migration -> Usage of redundant or deprecated syntax or deprecated symbols
Java -> Code maturity
