The program does not automatically adapt based on entries you input. The programs are prescribed and will very in intensity and duration from the start to the finish. In general your goal should be to complete the program as written and ideally hitting the IF (Intensity Factor) correctly for each workout.
I’ve recently completed the level 2 full marathon plan and found that some weeks or workouts were easy and others harder based on my volume and recovery. Trust the process and do your best to complete the program and I’m confident you will be well prepared when race day comes.