Article: https://wordpress.org/documentation/article/wordpress-editor/

Update for 6.3

• Add component 50260
• Display device icon on "preview" and "view" buttons 50218
• Distraction Free Mode: Don't show the metaboxes 48947
• Improve "switch to draft" placement 50217
• Add the command center to the post editor 50128
• Updates the behavior of the top toolbar fixed setting 49634
• Update the document title in the template mode of the post editor 50864
• Apply busy status to the publish button in progress and unify button width 48444
• [Inserter - Media tab]: Upload Openverse images when inserted 48501
• Show a pointer/hint in the settings tab informing the user about the styles tab 47670

Update for 6.2

• Introduce distraction free mode 41740
• Edit Post: Improve distraction-free mode notices 45348
• Move document information and outline to list view panel 44788
• Block Inspector: Make Settings tab the default . 47592
• Block Inspector: Avoid advanced panel only settings tab . 47474
• Stabilize the block inspector tabs experiment . 47045
• Add text only mode for block inspector tabs . 46968
• Remove Block Inspector Button . 46709
• Rename appearance tab to styles . 46027
• Only render sidebar tabs possessing items to display . 45991
• Add list view tab for Navigation block et al . 45483
• Split block tools into menu, settings, and appearance tabs . 45005
• Don't show empty reusable tab if not allowed to insert reusable blocks 46922
• Openverse integration 46251
• Replace text in Reusable tab with an icon 45851
• Restore the empty paragraph inserter 45542
• Add media tab 44918
• Rename view to Preview 45074
• Move wordcount to the top of the outline 46648
• Stabilize the block inspector tabs experiment 47045
• Block Inspector: Make Settings tab the default 47592

Refer to this blog post for more details on the block inspector

General

• Make sure all screenshots are relevant to the latest version
• Make sure videos, if any, are up to date
• Add ALT tags for the images
• Make sure the headings are in sentence case
• Convert all reusable blocks to a ‘regular block’.
• Update the changelog at the end of the article