Hi Copleston,
We are able to reproduce the issue at our end. So we have considered “Filter popup does not open ina mobile device” as a defect and logged a report for the same. We will include the defect fix in our upcoming June 17, 2020 patch release.
You can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through this link.
Regards,
Rajapandi R