Without the sidescreens the side(s)of the cover can be clipped to the outside of the doors. I think it tends to come a bit close to your hands on the steering wheel and can flap a bit.
With the sidescreens in place the sides of the cover are folded around the door opening (the door is actually closed against them, and then it is tucked behind the seat. A neat inward fold can be made so that the surplus cloth over the corner of the door opening is tucked in and doesn't flap. I am thinking of fitting a press stud to the section of inner panel next to the seat (using an existing stud in the cover itself) to hold the thing more securely.
The centre section can be folded into a long triangle and then rolled up and dropped behind the seats or tucked on top of the luggage. This ten leaves the seat belts reasonably free.
Since fitting the 2 side zips I have not used the hood cover as the tonneau cover used in this way does that job too.
If anyone wants some photos I can make a few photos of how I do it.