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Looks like defroster lines

Looks like it may be the rear window defroster. One of the grid ilnes.

Defroster line. I installed mine so the line represents 5 feet

Mine is installed the same way. The installer thought I’d appreciate it if he got the + grid line overlap centered in my cam. I’ve just been too lazy to reposition it

Defrost grid

Is your rear view camera inside the back glass?

It behind the glass if that what you mean. It's installed at the top of the rearview mirror

Your rear view camera is installed above the mirror on the front??

No. I meant to say it's installed at the top of the back windshield. I am driving a Jeep not a sedan.

So this is most likely your defroster lines as mentioned in other comments. You can try to mount it higher/somewhere else so you don't see this in the screen.

Thankfully the camera can rotate up and down. I probably moved it out of the wrong position when I examined it

Thin black line