Congrats! You've made it to the end of Life is Strange: True Colors. There aren't many major choices to make in Chapter 5: "Side B" as this chapter delivers on the consequences of your actions. There is, however, one missable choice you'll need to make in order to determine what ending Alex gets. There's an escape room puzzle you have to beat too.
True Colors can end in several different ways and most of those endings are dependent on decisions you made in Chapters 1-4. So if you're unsatisfied with how Alex's journey ends, you'll need to go back and replay the game. Thankfully, True Colors isn't all that long--you can knock out the game in one or two sittings if you want to. You can also replay certain chapters without affecting Alex's story if you want to go back and nab any Achievements/Trophies that you missed.
If you're having trouble, follow these steps to get out of the room.
Try the door, only for the doorknob to not workInspect the guitar case, which will reveal that the case doesn't recognize you and needs your "true" identityInspect the file on the desk, revealing that Alex perceives herself as a patient with mental and emotional baggage, and her patient number is 53322Inspect the number lock on the guitar case and enter Alex's "true" identity--since you're Patient 53322, the combination needed is 53322Take out the guitar--Alex will notice she can't play it since it's not correctly tunedInspect the photos on the wall, Alex will take note that one is of a tuning peg for a guitar--removing the photo from the wall causes a real tuning peg to fall into your handGo back to the guitar--Alex can now play it, which allows you to get out of the room
This may seem like it's locking you down a specific path but it's not. It will inform the dialogue in following conversations but this choice will not fundamentally alter the ending to Alex's journey. So pick whichever choice speaks to you and the Alex that you're playing.
Neither option has major consequences on the outcome of the story, so it really depends on just how much you want to twist the metaphorical knife that Alex stabs into Jed's heart during this confrontation. As far as we can tell, True Colors never outright states whether Alex's forgiveness in this moment is sincere, so you could argue that forgiving Jed can be read as either the "good" or "bad" choice. Maybe she's being sincere or maybe she's saying the one thing that she knows will show how much of a monster Jed is.
This choice does have an impact on the ending of True Colors. There are six possible endings to the game, and the biggest influence to what ending you get is whether Alex is dating someone. So it's up to you: Do you want Ryan in Alex's life or would you prefer she face her future solo?