The Federalists were in favor of the Constitution while the Antifederalists were not. How did these two groups agree to the new constitution? (What was the compromise?)

The Federalists were in favor of ratifying the Constitution. They believed a stronger national government was needed because of the issues faced by the government under the Articles of Confederation. The Federalists saw a government that struggled with finances, keeping order, and dealing with other countries. They believed a new plan of government was needed.
The Antifederalists were opposed to the Constitution. They believed the federal government that would be created by the Constitution would have too much power. One of the bigger concerns that the Antifederalists had dealt with the fear that the Constitution didn’t protect individual rights. Many states said they wouldn’t ratify the new Constitution unless something was done to protect the people’s rights. As a result, a promise was made to add a Bill of Rights to the Constitution. The Bill of Rights became the first ten amendments to the Constitution. Once this promise was made, the states that were concerned about the new Constitution voted in favor of ratifying it.
https://www.constitutionfacts.com/us-articles-of-confederation/the-great-debate/

https://www.ushistory.org/us/16b.asp