Is this meant to be like this? Windows and doors.

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Hi everyone,

could someone qualified please tell me what the part of my external door that the red arrow is pointing to in the photo and whether it has a purpose?
Since the majority of the screws on all windows and doors are overlapping, compressing and often warping the frame, it would be very helpful to know.

I really don’t trust this company or its judgement, and to really drive it home, I just want to note a single example.
I’d forgotten about a cheap catnip ball toy thing that I’d stuck onto the inside window wall? It had its own cheap self adhesive tab thing attached which could be removed easily, but rather than mention it to me, the installers just siliconed around it and it had to be the weirdest thing I’d seen someone do in a long time. It was obviously not a permanent fixture.

There have been no end of issues with the install and I don’t trust the company a single bit to tell the truth now. I’ve had to have the exterior doors realigned numerous times since install in May and it’s been confirmed the front door frame will need replacing again (third time including original renewal installed) if that’s of any use.

Thanks
 

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That plastic line moulded along virtual frame from top to bottom you mean?
 
To line up and hold catch plate on the latch side

Frame is just a frame. Sides aren't different just because there is no latch plate. They run 1000s metres all the same.
 
In the particular photo example the line has no use , being on the hinge side. Ideally your frames shouldn't be ' warped' around screw heads but invariably there is a small amount as to make sure the screw is tight
 

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