Would replacing it with a single door and sidelights fix the problem? There are 56x80 units that fit in a 58" RO.

You could also use a 36" door with a single sidelight and have plenty of room for trim.

Is that a new install? The door is too large for that space and doesn't look like it is framed in correctly.

I would remove it and get a smaller door, so you can have trim on both sides. No, trim on the opposite wall, is not a good idea. The door, just plain does not fit there. It looks too big for the area too. Sorry, because the door looks new.

Why was this the placement that was decided ? It is wrong to me with a new header it could have been installed to the left IMO.

Trim around a door isn't just an aesthetic issue. It functions to keep the door jambs straight and plumb. To keep the jambs from twisting and going squirrely. And is the final step in integrating the door assembly solidly into the framing.

The door is too large as is. Also looks as though a jack stud supporting the header may have been removed. If so, that is a big No-No.

What you have now is rather like putting three brand new tires on a car & leaving a bald tire on one of the drive wheels.

it could have been installed to the left IMO.

Not possible, Patricia. There is an exterior wall that prevents the door from being shifted to the left. And an interior wall on the right that restricts the size of door that will fit in that space.

You could also step down to a 48 x 80 French door assembly. If a 56 x 80 is too large (assuming you have a 60 x 80 assembly in there now.)

48 x 80 French Doors

Functionally that size may be something of a PITA if you use the door often for anything other than letting pets in & out. May be necessary if you don't like the idea of a single door + sidelight.

If you’re not going to switch out the doors, you’re just going to have to use some skinny, non-matching trim on the right. Trying to mount matching trim on the connecting wall would just look goofy and draw more attention to the problem.