Thank you for writing your query in Pega Support Community!
A freeform layout is a one-off page layout. It should never be used in Pega 7. What differentiates a freeform layout from a smart layout is that the columns of a smart layout have column types of Label, Field, or Spacer that align, while freeform layouts do not.
Any changes to your design when using a freeform layout means that you have to fix every single section. This is primarily why you should never use a freeform layout. With a dynamic layout, you do not have to change a single section; the change is only restricted to the skin
You can convert a freeform layout to a smart layout by changing the column type of all its columns.