Different time signatures for left and right hand

In a piano part (or for that matter in any instrument that uses more than one staff or in a full score), how can I create a time signature of 3/4 in the right hand and 6/8 in the left hand? (I’m assuming this is possible because I see music written that way — I don’t know that it was created with Dorico.)

I’m guessing this is in the manual somewhere but on first perusal I can’t find it. I’m not sure what to search for.

You create an independent time signature by terminating the popover with alt-enter rather than just enter.
So shift-M 3/4 alt-enter will make that stave independent of others.
Which one you choose make independent of the other is entirely up to the local context.

(Edit: this same rule applies to other popovers, such as local key signatures or local chords)

As Janus says…

Searching in the web-help Manual for “different time signature” or “independent time signature” give as first two results: input time signature with the panel/the popover

The procedure to apply the TS only to a specific staff is specified under point 6 for both:

That all works. Thanks.