Parallel glissandi within split parts

I am having difficulty working around having a split Vln I part that glissandos in parallel. I’d LIKE to have two parallel glissandi markings between both split parts, not just the one glissando in the top voice as shown in the screengrab below. I understand the workaround with hiding the noteheads, etc. but I can’t seem to find a way to get the lower glissando marking to appear. Is there some trick I’m missing? Thanks so much! I can’t say enough good things about this product. It’s changed my entire engraving/orchestrating process, much for the better! Thanks for all your hard work, guys!
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I dont’ have a problem notating a double gliss.