Layout XL - switch drain and source of a transistor with multiple fingers

Hello community

I have transistors with 8 fingers, resulting in 4 diffusion areas for the source and 5 areas for the drain.

I'm looking for the option in Layout XL where I can switch drain and source of a transistor, leading to a layout with 5 diffusion areas for the source and 4 for the drain.

I now that I can simply connect them in a 'wrong' way and the software automatically switches the nets then. However, sometimes this does not work. I guess it's due to fixed net names?

Is there a way to manually change it?

Thanks for any advice!

Regards domi