That’s done via the archive page widget that displays the ‘single’ template Ele Custom Skin creates. This plugin only creates the single instance template for the grid.
I’m not sure I understand where.
I created a custom skin, then, on the page where I want to list the articles, I put Posts Elementor Widget, I selected as Custom Skin that custom skin that I created earlier, I chose the option to display in 3 columns , but I don’t see where I can select the number of items to display.
Use the ‘Posts’ option vs. the ‘Posts Archive’. This will allow you to set the number of posts, still select the skin. You will need to just select in the query tab however which archive type you want it to pull the data from. Here’s a couple screenshots.