It's about something similar to the ReSharper feature "Go to Next/Previous Member", but inside IntelliJ (not this similarly named question)
The Alt+Up/Down in IntellJ is by default mapped to "Previous/Next Method", so it skips member variables, whereas ReSharper maps that to "Next/Previous Member", which obviously steps over everything, including fields and properties.
Is there any solution for IntelliJ to mimic ReSharper's feature, perhaps through a plugin or anything else?
This feature has been implemented and reverted because of negative feedback (https://youtrack.jetbrains.com/issue/IDEA-107538).
This behavior can still be turned on by adding to "Help | Edit custom VM options":
-Dide.structural.navigation.visit.fields=true