Disable WordPress Block Editor Fullscreen Mode

Disable WordPress Block Editor Fullscreen Mode, activated by default in WordPress 5.4.

Full credit to Jean-Baptiste Audras for his blog on how to do this. https://jeanbaptisteaudras.com/en/2020/03/disable-block-editor-default-fullscreen-mode-in-wordpress-5-4/

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Credits

• Thanks to Jean-Baptiste Audras for his blog on how to do this