Reattach the rear awning leg and lower both leg sections completely.
Caravan awning sagging.
You can leave the support arms hanging freely but it might help to simply slide the stops back into the leg channel.
Roll the awning back up to observe how tight it is.
Screw the other side of the awning in place using a second hex screw.
Poor tension typically results in a saggy center which acts as a water collection pool.
You do not need to put the screws back in.
Here is brad taylor showing how to adjust an awning fabric.
Awnings rely on a solid supportive frame to keep the fabric stretched flat and tight.
During regular use of your rv the awning fabric and slide in the awning tube causing alignment is.
Feed a hex screw though the side edges of the awning.
The problem seems to be because the awning is 3 5metres deep there is a full extra set of poles at 2 5metres and because the extra front metre is tight its stops the main 2 5 metre roof from tightening.
When the fabric starts to sag again extend the fabric out an extra 1 or 2 inches a time to keep it tight.