A/C vents stuck on defrost

This is a pretty common complaint. Here is a guide that will run through the most common causes:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Let us know what you find but I suspect the mode door actuator (Toyota calls it the air outlet control servomotor) has failed and so the default position is defrost so that you always have air coming out in order to defrost/defog the windshield if needed.

Run through the guide and let us know what you find.