Either they are in a cult where their human leaders think they can change the 10 commandments ie the papacy.....or they in most cases threw the baby out with the bathwater.
Just can't go day without anti-Catholicism, can you? Show me an historical source or in Church teaching where a Pope changed the Sabbath.

___Just can’t go day without anti-Catholicism, can you? Show me an historical source or in Church teaching where a Pope changed the Sabbath.___
Who else changed it. Nobody in the Bible did. I suggest you read Rome’s Challenge. Did you not read it? It was put out by your own church.
And it’s brilliant. Also in Canon 29 of the council of Laodecia, your church said anyone who rests on the seventh day is Anathema from Christ.
See, your church hates the Sabbath and those who keep it. Because it exposes you. It identifies your church as the great false counterfeit. The change of the Sabbath was predicted. The only text that shows the Sabbath was to be changed is the prophecy that the AntiChrist would change it!!
Is’nt that ironic. Daniel 7:25.
anyways, here is Rome’s Challenge to Protestants. it’s brilliant and I applaud your church for producing it.......and she says there’s not a text in the Bible that changes it......she says SHE CHANGED IT and it was done because she has the power to do it. The authority. When you think you are the “vicar of Christ” on earth.......yeah, you can do pretty much anything you want........and she has and she will again.....
https://www.romeschallenge.com/
#1 In 321 AD, Roman Emperor Constantine I issued an edict mandating a day of rest on Sunday, which he termed "the venerable day of the sun." This decree, while reflecting his Christian beliefs and aligning with the Roman worship of the sun god. He did this with close collaboration of Bishop Eusebius. cited in the "Commentary on the Apocalypse" Moses Stuart Vol. 2 9, 40. Andover, Merrill and Wardwell 1845.
#2 See A Doctrinal Catechism by Rev. Stephen Keenan p. 174 claiming Romes authority to change the Sabbath to Sunday
#3 Dr. Butlers Catechism Revised p. 57 More Rome has authority to change Sabbath to Sunday.
Sabbath observance was still going on in AD 364 proved by the fact that the Church Council of Laodicea forbade the observance of the Biblical Sabbath.