Do you need the few inches on the beam side because you want to push the curtain all the way open? Or will the curtain stay in place?

Please show the other side of the window and a photo of one of the other windows whose curtain arrangement you like.

Is there a matching valance available?

Also, can you sew?

I need to see the whole space and the other windows . Post those pics here in a comment

start another post.

Hang the curtain rod the same height as the others. You won't be able to open the drapes all the way on that side, but it won't look awkward like it does now. You need a center bracket so it doesn't sag in the middle.

At the proper height, no one will notice but you and after a while not so much either.

Don't use curtains. Use blinds or shades and hang them inside the window frames.

I would not choose a black rod. It is obtrusive with the transparent curtains. Is there a matching beam on the other side of the window?