I have not used Loft in my work for a long time and some things have been forgotten, alas.
I can't figure out how to make a rounded ending.
Maybe there is some easy way to automatically complete such sets of splines when Loft?

You include a point in the same plane as the last profile

Brilliant! I would never have figured it out myself.
Thanks a lot !!!

Hi krass, yes a point along with Loft style = "Loose" can be good for that.

There are some examples in the help file:
https://moi3d.com/4.0/docs/moi_command_reference7.htm#loft

- Michael

Yes, I know about this mode.
Unfortunately, this mode is not suitable for all other geometry of this product.
But a solution with a dot is what you need "