PenciDesign Supporter replied
Staff Reply
Hi,
1. You can change the 404 content by going to Appearance → Customize → Pages → 404 Page,
2. If you want to highly customize the 404 page, please use the Elementor to create it by reading the document here: https://elementor.com/blog/create-custom-wordpress-404-page/
Regards,
PenciDesign.