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If it is a fixed panel, I'd probably take the operating door off the hinges (pop the pins, starting with the bottom) and then uninstall the unit. Most likely you will find screws under the hinge leaves on the jamb and maybe one in the centre top and bottom depending on how well the installation went initally. If you have a rare earth magnet, you can check the fixed jamb side for screws that have filler over them. Mind you, if you're taking the whole unit out, you need to remove the casing, and if they didn't use spray foam, you'll be able to see where the shims and screws are on the fixed side.
Having a carpenter friend can really help out, but there are plenty of resources online to show you how to install a door once you get it out. Fine homebuilding is a good resource.
Marc
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