There are some places that say "subclass mockMaker is the default" or "in the future, inline will be the default", e.g.

• https://javadoc.io/static/org.mockito/mockito-core/5.3.1/org/mockito/Mockito.html#mock_maker_plugin ("proxy generation engine" sounds wrong)
• https://javadoc.io/static/org.mockito/mockito-core/5.3.1/org/mockito/Mockito.html#Mocking_Final
• https://javadoc.io/static/org.mockito/mockito-core/5.3.1/org/mockito/Mockito.html#mockito-inline
• https://javadoc.io/static/org.mockito/mockito-core/5.3.1/org/mockito/Mockito.html#individual_mock_maker (the text)
• https://github.com/mockito/mockito/blob/main/src/main/java/org/mockito/internal/creation/bytebuddy/ByteBuddyMockMaker.java#LL19C32-L19C32

Maybe there are more, I mostly just ctrl+f for "default" and "mockmaker".