What is Screen Options?
Screen Options is a menu button in the WordPress admin area of some pages that enables you to control how to view the page. These options are available for both pages and posts.
More About Screen Options
The Screen Options menu helps you organize your Admin view of each page to manage it better. It contains options to show and hide particular sections of the screen and settings to determine how many items to display.
For instance, you can limit how many comments are displayed on the page. Additionally, you can hide any fields you don’t use, such as the discussion meta box.
To access the Screen Options in the Block Editor, click on the three dots in the top-right of the screen and select Options.