Issue Summary

While creating a new series on a report, the first time the pop-up opens the field "Filter by" can be edited. If you cancel and add a new series, the field will be greyed out, preventing the user to add a JQL to it.

Steps to Reproduce

1. Edit a report or create a custom report;
2. Add a series and try to edit the "Filter by" field.

Expected Results

The field is editable and you can enter a JQL on it.

Actual Results

The "Filter By" field is greyed out, preventing the user to add a JQL.

While creating a custom report: https://share.getcloudapp.com/YEupydqK
While editing an existing report: https://share.getcloudapp.com/NQug1vDX

Workaround

Reload the browser page and try to edit/add the series again.