Not sure what you mean but I will show you in the DAW as you can see it better than in Biab Riff Edit.
Do you want the strum to sustain into the next bar where playing starts ?
As you can see if I extend the Hold you will see the shots in the source file also.
You can also start the Hold earlier or later, but only in the DAW you can change it to a quick strum or Slow strum by changing the playback rate of the item.

[Linked Image - Only viewable when logged in]