There are a couple of options that you could do.
The first option involves utilizing the app to create a new workout program for 30 minutes. To view how this is done, please visit this page. Just ensure that you're selecting "30 minutes" underneath the workout duration.
The second option is that you can utilize some time-saving strategies on your existing program.
- Supersets. This is when you perform exercises back to back with about a minute of rest in between exercises and sets. In order for this to be as effective as possible, you’ll want to pair exercises together that have opposing muscle groups. For example, a flat dumbbell press (chest/shoulders/triceps) with a bicep curl (biceps). This way each muscle group gets ample of time of rest while you work on a different muscle group. It would be best if you utilized this only for isolation exercises and not compound exercises like squats, deadlifts, etc.
- Rest Pause Sets. This is a technique where you choose one weight for an exercise and one goal rep target (e.g. 30 reps). You perform as many reps as possible in the first set, rest for 15-20 seconds, and perform as many reps as possible in the next set. You repeat this pattern until the total number of reps has been completed. This should only be utilized on exercises where you can comfortably go to failure without putting yourself at risk, i.e. do not incorporate this technique with compound exercises like squats, deadlift, bench, overhead press, etc.
- Drop Sets. This is a technique that is similar to rest pause sets, except you change the weight lifted from set to set. You can choose how many sets you perform, but a common number is 3. You’ll then start with a heavier weight for set 1 and perform as many reps as possible. For set 2, you’ll drop down the weight and perform as many reps as possible. You’ll continue with this pattern until you’ve reached your corresponding target set volume.