Begin by slicing the lemon and orange thinly, then juice the lemon and orange into a small bowl, removing any seeds.
Pour the chilled white wine into a large pitcher, then stir in the citrus juice and simple syrup until well combined.
Add the citrus slices to the pitcher, followed by the sliced peach and berries, creating a colorful mix.
Gently muddle the fruit with a wooden spoon or muddler to release their juices and aroma, making the mixture fragrant and vibrant.
Add the mint leaves, gently pressing them in to release their fresh scent without tearing them apart.
Fill the pitcher with large ice cubes, which will chill the sangria and slow dilution while adding a satisfying clink as you pour.
Just before serving, pour the chilled club soda into the pitcher, giving it a gentle stir to combine the bubbles and flavors.
Serve the sangria immediately in glasses filled with extra ice if desired, and garnish with additional fruit slices or mint leaves for presentation.