You can configure the settings for the 404 page on your site via Admin Dashboard > Appearance > Customize > General Options > Layouts > 404 Page.
The following are the available settings for setting up a 404 page.
Upload 404 Image – Set an image to display on the 404 page.
Show Latest Posts – Enable this option to display the latest post on the 404 page.
Number of Posts – Select the number of posts to display on the Latest post section.
Number of Posts per Row – Select the number of posts to display per row on the Latest post section.
Show Blog Page Button – Enable this option to display the Blog page button on the 404 page.