If you are using a standard dropdown filter in a Quick Controller, you will have the option to activate Smart Dropdowns.
Enter the configuration of your Quick Controller gadget
Add a dropdown filter
Check “Smart Dropdowns”
When enabled, "Smart Dropdowns" ensure that dropdown filters only provide meaningful suggestions, i.e. suggestions that match the current state of the Quick Controller. Suggestions are dynamically narrowed down based on what filters are active on your Quick Controller.
Consider the following example:
Here, the “assignee” dropdown will only show users assigned to issues that are in the project “Quality” and have the priority “Medium”.
When you activate Smart Dropdowns, you can also define a static Base JQL, to narrow down results in your filter dropdowns regardless of the current state of the Quick Controller. In the example above, only assignees of issues with the “database” component will be shown.
Smart dropdowns will not show all possible values, but instead only values that are actually used by the currently filtered issues. In the example above, this means that not all possible assignees of the project “Quality” will be shown, but instead only the users that are actually assigned to issues in this project.
Only the first 1000 filtered issues are used for smart dropdowns suggestions.
If no value is found, all possible values of the Jira instance will be shown as suggestions, as if the “Smart Dropdowns” option wasn’t enabled.
Some special JQL fields are not supported with “Smart Dropdowns”, such as “watcher”, “voter” or fields where the data is not stored within each issue (e.g. “filter”).
Custom JQL dropdowns are not affected by Smart Dropdowns.