You can customize the number of posts per page using the Combo Blocks plugin. This article gives you a clear idea of how to add a custom number of posts per page.
Click on the “Query Post” tab.
![How to display custom number of posts per page? 1](https://i.imgur.com/ZSxjqOD.png)
Now expand “Posts Per Page” by clicking on it and entering the number of posts that you want to show on post grid. By default, it is “10”.
![How to display custom number of posts per page? 2 X9Y3IVZ](https://i.imgur.com/X9Y3IVZ.png)