You don't say what the brand is, but I think they are the same type whether Carefree or Dometic.
On mine, the drive sheared the connector between the motor and the roller. The arms being spring loaded, opened the awning all the way and of course, it wouldn't retract electrically or manually because the connector had sheared.
If that is the case, there are two options. 1 as you already know is to remove it completely. That would entail a) disconnecting the electrical wiring harness, b) removing the screws that hold the awning in the rail as well as c) the screws that lock the awning against the rail/wall. Then slide the awning off the rail.
And 2) compress the awning arms and fold the awning fabric in such a way that you can secure it with tie wraps or wire. But you have to be very careful that you don't leave an opening in the front of the fabric to catch wind. On my Carefree, I was able to roll up the fabric and secure it with tie wraps.
If there is an opening, wind will find it.....and it will remove the awning for you which you may not like.