settings -> maven -> repositories no local maven repositories index

This dialog is blank if you don't define custom repositories in pom.xml.

I remember, at old version, there has a local cached repository index ????

There was a bug: https://youtrack.jetbrains.com/issue/IDEA-219426 Fixed in 2019.3 version. Please feel free to try it with EAP build from https://www.jetbrains.com/idea/nextversion/