The content editor in WordPress often does not use the full width of the editor or screen to display content, and the content can wrap early. The content editor can be made full width and for the content to wrap on the very right margin.
The default width of content in the editor.
Note: This example and the snapshot from the editor is when using the Twenty Seventeen theme. The editor in other themes may look slightly different and the content may also wrap differently.
The content editor made full width of the screen.
Where and how to make the content editor full width of the screen:
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