The Editor is displaying strangely when creating a post

[westnz]

Description

When I created a new post, the title and lists were displayed in the middle of the page. The text is also displayed very widely.

Step-by-step reproduction instructions

Expected behaviour

The title, lists and text are all aligned normally.

Actual behaviour

When I created a new post, the title and lists were displayed in the middle of the page. The text is also displayed very widely.

Screenshots or screen recording (optional)

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Environment information

• Browser(s) are you seeing the problem on: Chrome
• Device you are using and operating system: Macbook Pro