Some websites only display pagination options after a button is clicked.
An example could be a list of restaurants on a page, and in the sidebar there's a button that says "Show all 400 items". Only after that button is clicked does the "Load More" pagination appear at the bottom of the page.
The challenge
Trying to specify the pagination setting won't work because the button hasn't been revealed upon page load.
You may only have the URL for the initial page (the one that has the "Show all items" button).
The solution
Train your robot on that initial page, and since it can mimic your actions, you would then click on that button that reveals the pagination option.
Once you've done that, you can select the data you'd like to scrape, specify the number of items you'd like to scrape, and choose the pagination option (now that the Load More button is displayed, for example).
In this animated GIF below, notice that clicking on View them all brings us to a page where the Load More button is visible.