ODK Collect: Is there any feature available to search questions in the edit-form question list?
Are you talking about searching for a specific question in the jump/hierarchy screen? There is currently no such functionality. You can strategically design your group structure so that it's easy to access specific questions. Or now you can use ⋮ > Check for errors from the form filling screen to jump to the first required question that has no value. If those don't work for you, please describe your use case in detail.
Or could you be talking about searching the list of filled form drafts to find a record with a value in it? If so, you can include the values you want to search for in the filled form name (instance_name in XLSForm) and search from the drafts screen.