It's a good idea to explore different apps and find the one that aligns with your goals and provides an intuitive interface that fits your lifestyle. You can multiselect on your phone by pressing on the three dots on the top right of the day, clicking Multi-Select, selecting the foods you want, then pressing the three dots and press copy, then go to the day you want and hit the three dots again to paste. On the computer, you can just press shift, click the food items you want to copy, three.