I get bunches of emails asking what happened to the "Custom Fields" meta box on the "Edit Posts" screen. They're hidden by default with the new Block Editor, so questions like, "do I need to install a plugin to get them back again?" No you don't. To view the Custom Fields for any post, click the three dots in the upper-right corner of the screen and then do one of these:
- For older versions of WordPress, go to Options and check the box to enable Custom Fields (under "Advanced Panels").
- For newer versions of WordPress, go to Preferences > Panels and check the box to enable Custom Fields (under "Additional").
After enabling, scroll down the page to find the Custom Fields meta box.