I tried to look close at the gazebo top in the pics and read through description.
Unfortunately, I got what I was trying to avoid.
There are gromets in the top that I'm assuming are to prevent water pooling .  
Water still pools and will sit for days after rain has stopped. I go out with a broom to knock all the water out.
The grommets allow water to drop through.  These are located above where seating would be located.

The only way I can think to fix this is to mark the area to have ties added and take the canvas to local shop that can see ties on to bring the canvas from drooped to taught.
The point of this Gazebo was to be able to close currents during wind and rain and stay dry.
We had high winds and several bars bent.
After just a few months after set up, this Gazebo is going to be high maintenance to make it work for us.
Very disappointed.