It may be a preset but I believe you should be able to add the search bar back in. Do you have a workbook we could test with?
Was there ever a fix to this? I am currently trying to figure this out as well. The search box is available on the desktop, but when I load it up in the app the filter is available as a huge drop down box but there is no longer a searchable text box. I have 4,000 filter objects, so the user being able to search for what they need is vital.