Ok so this morning I spoke to the rep from window world who forwarded the pics to his installers. They confirmed to try to pop the top channel where I marked (1). If that pops out then there should be a bottom channel that pops out. If the top channel does not pop out they said to put a screw at the top corner at an angle where I put a circle and a screw at the bottom corner outside. Also where I put a circle. They also recommended to use white head screws.
They also said to always use screws even if they are exposed. Window should never be installed just with silicone or expansion foam. They need to be screwed in and obviously shimmed so the window frame doesn’t distort.
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