I am facing similar issue '[Bug-611]Perspective Dropdown option list collapses if option list scrollbar is clicked' .How to resolve this issue .I am using 8.1.20 Ignition version.
Thanks in Advance.
The last post before your deleted post in that thread says,
Looks like this same issue has returned in 8.1.20… but fixed in 8.1.21 rc1
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