Unable to configure fields in activity stream

Unable to configure fields in activity stream (no funnel) because the activity stream expands the entire width of the form.

1. Navigate to a record (such as an incident) with an activity stream.
2. Identify a read-only field (such as Priority) on the form.
3. Click the menu icon  and select Configure > Form Layout.
4. Move the read-only field you identified in step 2 directly above the Activities (filtered) form element.
   Note that the read-only field is displayed, but the activity stream expands the entire width of the form and you cannot configure activity stream fields using the funnel icon .

No workaround is available. The issue no longer occurs as of the Istanbul release.