When working with WordPress, the number of items per page by default is 20. The items can be pages, posts, categories or posts. In some situations, you may need to increase the number to make your work easy.
If you want to have more than 20 posts a page, please follow the steps below:
Step 1: Login your site;
Step 2: On your Dashboard, click "Posts" from the left navigation;
Step 3: Click "Screen Options" from the top right corner;
Step 4: Change 20 to a different number, for example, 50, then click "Apply".
If you want to the number of categories or tags per page, please click the "Categories" or "Tags" under "Posts", then click "Screen Options" to change the number.
If you want to change the number of "Pages" per page, please click "Pages" first, then click "Screen Options" to change the number.
Please note that when changing to a large number of items per page, your PHP memory might run out. Please check how to increase the PHP memory limit.