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WordPress 6.3 is the final major release of Phase 2 of the WordPress roadmap. During the second phase, development mainly focused on the Site Editor, increased its functionality, and improved interface and usability.
Now site creators can design layouts and manage content within the same interface, without having to jump from one admin area to another and without having to write a single line of code.
With WordPress 6.3, 10 versions of the Gutenberg plugin are merged into the core, and if you don’t use Gutenberg on your website, you will see a lot of changes in the Site Editor’s interface.