Why there are two settings in one line exclusively in PLM?

Seems inconsistent when compared to every other setting.

What do you mean by “in one line”?

If you mean why are there 2 settings for the same context, it is because they have the same context.

If that’s the case, why the third setting in its own line if it’s still in the same context?

The first two must be provided together.
The third is optional.