When creating a Performance Report using the designer in Operator Console we cannot rename charts. Clicking on the chart title does not do anything and we cannot find any way to change the name from Chart-Title-1.
Release : 20.4 CU6
This is a known issue with the release build of CU6 that affects Firefox browser.
As a workaround, you can use Chrome which does not have this issue.
This issue is resolved in CU7 and later.