You can display popups by scrolling percent using the Post Grid Combo plugin. This article will help you to display a popup by scroll percent.
To begin, insert a “Popup” block.
Click on the Visibility Tab and click on the Add Group button.
Then Click on the Add Condition Button to add a condition to load the popup by scrolling percent.
Here, Choose Scroll Percent to make the popup display by scrolling percent.
Now give the proper value. For Example, Scroll Minimum is 30, and Scroll Maximum is 50.