When editing a content within a dialog there are some layout shift when you click in the tabs.
One way to avoid this it putting in the dialog options a fixed with and height, in pixels or percentaje.
But i you do this this settings will be for both choose component and edit component.
In layout paragraphs is posible to select with css the dialog of choose component to apply a width and height) but in Mercury editor this classes are overwritten with the same settings.
Active
2.1
User interface