Rehau unit removal. For fitting.

[festive]

I have an idea but can someone confirm how I remove unit from this rehau frame so I can put my frame fixers in thanks.
It has astra gal bar glazing I guess remove the bars?

 

[God]

Thats an opening sash why do you need to deglaze it. If it has a fixed pane pull the astragal bars off, they should be just clipped on

 

[festive]

Thanks God it is a fixed unit screwed into the main frame. Ok I tried to prize off one of the bars and it felt like i was prizing off the adhesive bracket as well. Any tips. Spoke to window company they said don't remove ir and use some strapping or foam.