From structure +‎ -ed.

structured (comparative more structured, superlative most structured)

1. Having structure; organized.
   • 1985, Robert Burchfield, The English Language, Oxford: Oxford University Press, page 137:

     Over the centuries the movement of clans and tribes of people has provided the kind of crop that would emerge if a blind god had sprinkled seeds at random on a field - a vast array of diverse patterns, usually not even interlocking or decussated, but crossed and intersected by every kind of structured diversity.

   • 2020 March 16, Matt Villano, “How ‘regular school’ parents can homeschool their kids”, in CNN‎^[1]:

     Dr. Jessie Voigts, a homeschooler and founder of Wandering Educators, a global community of educators sharing travel experiences, said it doesn’t matter if this time is structured or unstructured, so long as the kids get outside.

structured

1. simple past and past participle of structure

   He structured the loan with a twenty-year term.