How to use SelectorElementScroll on Plex Movies

I'm trying to scrape all link of moviepages on Plex Movies. I start from the categories page:
https://app.plex.tv/desktop/#!/media/tv.plex.provider.vod?source=movies&pivot=vod.categories
I've set the 12 pages as links and within those pages I'm extracting the links of the movie titles. However, I can't get the SelectorElementScroll to work. I've tried selecting several elements, but it doesn't scroll. I keep ending up with 239 results, although there should be over 5000 results.

I'm a newbie with Web Scraper, just started using it today and I have to admit I can't read the code below. I've watched several tutorials about using the GUI including the video on SelectorElementScroll. I hope it's just a matter of picking something else as selector. Could anyone try?

Sitemap:
{"_id":"plex","startUrl":["Plex div[data-testid]","multiple":true,"delay":3000},{"id":"link","parentSelectors":["category"],"type":"SelectorLink","selector":"a.MetadataPosterCardTitle-singleLineTitle-lPd1B2","multiple":true,"delay":0}]}