Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper. Place the thawed puff pastry on the sheet and gently unfold it without stretching the dough.
Lightly score a ½-inch border around the edges of the pastry without cutting all the way through. Brush the pastry with beaten egg and sprinkle the center lightly with granulated sugar.
Bake the puff pastry for 18 to 20 minutes, or until it is puffed and deeply golden. Remove from the oven and let it cool completely on a wire rack.
Beat the softened cream cheese, powdered sugar, and vanilla until smooth. Add the heavy cream and continue beating until the mixture is creamy and thick enough to spread.
Gently press down the center of the cooled pastry if it has puffed significantly, leaving the raised border intact. Spread the cream filling evenly over the center.
Arrange the strawberries, blueberries, raspberries, kiwi, and peaches over the cream layer. You can arrange the fruit in rows, circles, or a simple colorful pattern.
Warm the apricot preserves with the water until smooth, then lightly brush the glaze over the fruit. Slice the tart and serve immediately or chill briefly before serving.