Add Editor "right margin" option to set the right-padding #2277

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• Completed

Describe the feature

I wish to customize the right-padding of the editor.

Sometimes the text is too much to the right and I cannot click the cursor well. It is also weird aesthetically if the text reaches the extreme end of the right side, so I lil bit of padding would be nice.

If applicable, add mockups / screenshots to help present your vision of the feature

No response