A different way to exit from capsule after use

Currently, if you have processed through multiple utterances/actions in a capsule, the only way to exit the capsule appears to be by pressing the back button repeatedly as you backtrack through the results from the aforementioned utterances. (Pressing the home button only takes you to the home screen and the capsule remains "running" in the background)

This may not pose issues for capsules that handle trivial tasks, but for capsules that deal with transactions (eg. payments, saving info to database, etc.), users may find themselves confused and concerned when they accidentally/instinctively press the back button after a completed transaction. (eg. User presses the back button after seeing the confirmation-view showing their receipt, which takes them back to the payment screen where they are asked to submit payment information again) 

Perhaps, I'm misinformed and there already exists a feature to prevent this from happening, but if not I would like to request a feature that allows users to exit capsules after use without having to repeatedly press the back button.

Thank you