Hello Daisyduke,
When we first got our Cali I also had trouble with swiveling the drivers seat but after a lot of fiddling I eventually came up with the following formula and it works for me every time:
1. After taking the appropriate precautions to prevent the vehicle moving, release the handbrake.
2. Wind the drivers seat back forward towards the steering wheel so that it is beyond the vertical and make sure the arm rests are as far down as they can go.
3. Whilst standing in the doorway at right angles to the vehicle, slide the seat until it lines up with the door pilar trim, as in the attached photo. You will see that the rear of the seat stitch line, the base of the seat back and the plastic seat base trim form an arrow shape. When standing a right angles to the vehicle the tip of the arrow should line up with the door pilar trim.
View attachment 12020
4. Swivel the seat slowly checking that it clears everything as it rotates. (You may need to make an adjustment to the steering wheel position although I haven't had to myself).
5. Apply the handbrake.
6. Adjust the seat and armrests to suit.
To return the seat to the driving position:
7. After taking the appropriate precautions to prevent the vehicle moving, release the handbrake.
8. Whilst standing in the doorway at right angles to the vehicle, wind the drivers seat back forward (towards the rear of the vehicle), so it is beyond the vertical and make sure the arm rests are as far down as they can go.
9. Slide the seat until the seat runner reaches the position detailed in the attached photos.
View attachment 12021
View attachment 12022
Notice how the rear of the hole in the seat slide runner lines up with the front edge of the base slide chassis.
10. Swivel the seat slowly checking that it clears everything as it rotates.
11. Apply the handbrake.
12. Adjust the seat and armrests to suit.
Whilst I have found that this works every time for me you may have to make some adjustments. I have arrived at this method because I personally didn't want to mark the vehicle or use tape. I don't know if it is possible to swivel the seat without being outside as I have never tried it. As I am sure that you have already discovered, swiveling the passenger seat is much less of an issue.
Good luck and happy adventures.
Paul