Mousewheel can only zoom in but not out again. Pretty much unusable that way.
Can confirm that as well. Unity 2019.3.0f1
Could you please submit a bug report for this issue and share the issue ID in this thread?
I reported this bug. Case 1204169
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The same bug in Unity 2019.2.17f1
You can track its progress here: https://issuetracker.unity3d.com/issues/cannot-zoom-out-audiosource-distance-functions-graph-when-the-graph-is-in-focus
(Same bug affects the audio source curve editor too)
Is there a workaround for this?
Not that I know of, but the team are working on it.
Heads up I figured out that you can edit the top number on the Y axis of the graph for those curves. Pretty unintuitive but there you go.