Search Collaboration (Advanced Search) feature in IMDB app (iOS)

Heya! My partner and I were trying to do a cross reference and figure out if one actor was in two movies we saw. We both have basic IMDB accounts set up, got the IMDB app downloaded to our iPhones (Mine is an iPhone 11 and hers is an 8). After a lot of digging around, the quickest way to do it was using Google Chrome from our Windows 10 desktop PC, click on the drop down arrow just to the left of the white Search bar on top of the page, click Advanced Search and then click 'Search Collaborations' on the next page. Boom! However we were trying to find this feature on the iPhone but can't find anything on it. What's even weirder is that on my iPhone 11, when I tap Search icon (magnifying glass) on the bottom of the main screen on the app, then tap on the white search box I get an 'Advanced Search' option on my drop down but it doesn't have a Collaborations feature in there, just some basic refining options. And on my partner's phone when she taps on the white search box she only gets a 'Find Movies and TV shows', but with the same basic refining options...... Any ideas? Thoughts? No biggie :)