Many of the features of a browser's Advanced Search page can be accomplished using the eBay app, but in many cases the feature is implemented differently in the app.
What are you searching for? What search feature are you trying to use with the app?
If you find yourself not easily able to search in a particular way using the eBay app, you may still be able to perform the search using a desktop browser (or a mobile browser in desktop mode) and then save the search, then use the saved search from within the eBay app.
