Glass panel like this one for the shower: http://www.overstock.com/Home-Garden/DreamLine-Aqua-Lux-Glass-45x72-Shower-Door-36x60-inch-Amazon-Shower-Base/6136916/product.html Or maybe like this one for the tub: http://www.overstock.com/Home-Garden/DreamLine-Aqua-Lux-48x58-Clear-Glass-and-Brushed-Nickel-Bathtub-Door/5612122/product.htm

Not sure what you want, seems like vertical blinds are in essence a folding screen, albeit one that is easy to open and close.

Need to shows us a complete picture of the shower area as well as a scaled floor plan where the "Shower Screen" will be.

(Long) the reason I ask about the sill and covered porch is I’m in the process of designing a 15’ wide bifold door between a poolhouse and pool deck, and finding a big disconnect between the glam minimalist details in the online photos vs the reality of doing this in the mid-Atlantic in a nice way. Without many local examples or manufacturers I am trying to use Marvin’s bifold door, because I’ve spec’d their other windows & doors for years with excellent service. Having issues designing the details though, when the poolhouse wall is open I want no abrupt elevation changes at the floor level interrupting the smooth plane of material between inside and outside. The trouble is for Marvin’s standard sill “performance” detail it is a whopping chunk @ 2” high AFF and 10” wide that doesn’t show in photos but is in their technical documents. This high sill is in conflict with the idea of having a visually seamless plane of inside outside space. If there must be a large surface mounted sill IMHO there needs to be visual cues of pausing and then carefully stepping over a wide curb instead of creating a confusing situation of continuous flooring but a big trip hazard in the way. Marvin provides a nice detail for recessing the 2” channel of sill into the concrete floor when framing, but they are clear that this install will not be warrantied for water or air infiltration. I would like to use the recessed channel detail anyway and keep water away using proper slope and covered porch and a flush linear drain, but as you know our ”mild” mid Atlantic climate can dump 2 feet of drifting snow and hurricanes that will blow through a flush sill into any living space anyway. I could slope and waterproof the pool house similar to a garage and sweep out a watery mess if it happens, but was hoping to use the pool house as year- round living space for guests without flooding or infiltration worries.