Yes, you allowed them to get sunburned. Don’t worry about it, they will survive, but you should move them to greater shade. The sunburned areas will remain, but new growth will be more sun-tolerant.

Thank you! Is there anything I can do to encourage new growth?

Now that the burning has already occurred, there is no need to move them unless you think it is still occurring. Hanging from the side of the tree farthest from the equator will provide the most shade throughout the day, a little east of center. In a couple weeks, I would remove the damaged leaves.

New growth will come with continued care, water before the soil get too dry, plenty of fresh air and sun.

Thank you!

Happy to provide food for thought. : )