For each coffee recipe you can adjust the strength according to your taste and to the size of your cups with the 'Memo' function.
Press and hold the button you want to adjust until the display shows the 'Memo' icon or the button starts flashing. Your machine then enters the programming phase and starts to brew the selected coffee. Stop the process by pressing the 'OK' button or the button you are programming. This depends on your espresso machine model.