How did the Peace of Westphalia affect the Rhenish Palatinate and the Upper Palatinate?

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Mainz: St. Martin's Cathedral — Rhineland-Palatinate St. Martin's Cathedral in Mainz, Germany.

The Peace of Westphalia (1648) significantly altered the territorial holdings of the Palatinate following the devastation of the Thirty Years’ War:

Rhenish Palatinate: The treaty restored these lands, along with a new electoral dignity, to Charles Louis, the son of the displaced elector palatine Frederick V.12
Upper Palatinate: This territory remained under the control of Bavaria following the settlement.12

Prior to this, Frederick V had been deprived of his German lands and electoral title in 1623, which were subsequently granted to Bavaria. The 1648 agreement effectively finalized this split, separating the two regions that had previously been held by the same branch of the House of Wittelsbach.1