Normally I use MultiRiffs by highlighting the section I want to work on, generating the MultiRiffs, then listen to each generated track along with the mix one at a time. (Mute the others so you can listen to one at a time with the rest of the backing tracks)

Note what you like about each one.

Copy/Paste the sections you like to a new track to build a brand new 'comp' track.
Remember you can copy measures 34 & 35 and paste them to 38 & 39 if you want .. it doesn't have to be used where it was generated; you can use any part wherever you think it would fit.

Sometimes I hear a lick at the 3rd generated bar that I think would work at the 8th bar (or whatever) ..
guess my point is you need to listen (audition) them and then use what you like.
If you want, you can do another multiriff generation after assembling your first comp'd track to see if you get anything better you can add/replace.

This method is also used with live tracks here; get a bunch of takes and assemble what you like.
As Jim mentioned; the Resolution setting can make a difference in the results when editing like this. Better precision when cutting, pasting etc.

I do not work here, but the benefits are still awesome
Make your sound your own!