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
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…