Hi Raul, I'm Joshua and I am happy to help.
I understand how you feel about the message feed sorting new messages from top to bottom. However, this feature cannot be turned off permanently as it is an integral part of the Teams user experience.
That being said, there are a few ways to customize your message feed to suit your needs. For instance, you can use filters to prioritize certain conversations or channels. You can also use the "mark as unread" feature to keep track of messages you haven't read yet.
As for your concern about the app updating and resetting your preferences, you can rest assured that Microsoft Teams takes user feedback seriously and continuously improves the app's functionality. If you have any suggestions or feedback, you can submit them through the Teams feedback portal.
I hope this information helps. Let me know if you have any other questions or concerns.
Regards,
Joshua.