To assemble, slice cake in half horizontally to make 2 layers. Place 1 layer, cut side up, on serving platter; spread evenly with 3/4 cup of the spreadable fruit. Place remaining layer, cut side down, on top. Spread whipped topping over top. Cut cake into squares or diamonds. Place on serving plate. Spoon scant 1/4 teaspoon remaining spreadable fruit onto top of each. Store in refrigerator.