How to remove spaces to the right of row?

[dninomiya]

I'm trying to implement an editor that makes the size of the editor fit the content.
There is a 41px margin on the right side of the row, so it cannot fit the content accurately.
Is there a way to remove the right margin?

thank you for your support!

[suren-atoyan]

Check the API here, you may find something. I've checked a few things, but could find a solution 🤔