Coarse, Medium, and Fine - Wall Patterns

You might notice that wall patterns disappear when you're switching between Coarse, Medium, and Fine detail levels.

Let's say you want to show your view (plan/section) in Coarse detail level:
To edit the pattern select the wall...
go to the wall's properties... and Edit/New...
Here you can change the Coarse Scale Fill Pattern parameter.

Now let's say you've switch your view to Medium or Fine detail level:
To edit the pattern select the wall...
go to the wall's properties... and Edit/New...
edit the structure...
and select your new material...
Here you can select your new cut pattern from available fill patterns.

I'm not sure why parameters for Revit's coarse, medium, and fine detail levels cut pattern settings are separated but this is a common question so I thought I'd post the answer.