How to search multiple fields with a single input
This feature is introduced in Canned Search 2.2.0
You can also use the Duplicate option which allow users to fill in only once, but search in more than 1 field.
When Duplicate is selected as the Type, you will be able to select the index (#) of the field value to copy over.
For example, as shown below, the value of the reporter field will copy the value of index #2 field, which is the assignee field.
In the gadget, fields selected as Duplicate Type will NOT be displayed.
In this case, the reporter field will not be displayed.
When searched, the input value in the assignee field will be copied over to the reporter field.
For example, if the assignee field value is admin, issues with admin as the assignee or reporter will be listed.
The JQL executed will be (assignee in ("admin") or reporter in ("admin")).