Are you referring the to Edit Form Types
demo? Is that possible that the RenderMode property is missing or is set to Classic? If this is not set anywhere in the project, then it will default to Classic which then loads the old styles and renders the grid with the old HTML structure.
Please see Render Modes
documentation and or Grid - Render Modes
demo to see it in action.
If this is not the case, please share the Grid configuration you have so far and we will check why it may appear different.
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