Lluechimbe55
You didn’t book a particular trip - the system suggested the correct ticket for the connection you’ve looked up in the timetable.
The applicable ‘fully flexible’ point-to-point ticket for this connection happens to be valid all day. It is valid for the route (mentioned on the ticket next to the QR code) during the mentioned validity period.
Therefore you are free to take exactly the train(s) according to the trip you’ve looked up, but you may also take an earlier or later one, or even better - spend 1 or 2 hours in Lauterbrunnen (for that Instagram photo spot) before proceeding to Mürren.