Custom dialog padding to content

How to configure the margins for the customized content of a dialog?

No matter the size of the Vertical Arrangement, the content always occupies 100% of the dialogue width.
How to solve?

My solution is:
Insert a horizontal arrangement between the title and the buttons.
Insert a Space into Horizontal Arrangement (set the Space Width 2%)
Move the Checkbox inside the Horizontal Arrangement and after Space.
Set Horizontal Arrangement Height to your liking.

I did it too. I would like to know if there is any other property or method that does not require the use of components on the screen.

There’s no other way to do what you want unless I know of.