Grouping elements

Elements can be grouped together to facilitate layout adjustment and DOM manipulation (adding attributes such as ID and class).

Do you mean adding ID props on right panel for elements?

No, it is not.
Select multiple elements in the editor. (ctrl + mouse click).
Currently, you can do this by enclosing them in a primitives box or div tag, but if you want to group them in the middle of the design, enclosing them in a box element or div will break the layout and you will have to adjust it again.
So I thought it would be useful to be able to group them immediately without breaking the layout.