Why does Acts call the Bereans more noble-minded than the Thessalonians?

Answer: They examined the Scriptures daily

The Bereans received the message eagerly and examined the Scriptures every day to see whether these things were true.

“As soon as night had fallen, the brothers sent Paul and Silas away to Berea. On arriving there, they went into the Jewish synagogue. Now the Bereans were more noble-minded than the Thessalonians, for they received the message with great eagerness and examined the Scriptures every day to see if these teachings were true.”— Acts 17:10-11 (BSB)