Would a retractable outdoor awning work to block the sun?

What about a shade sail out on the deck?

We have a west-facing deck too, so I know what you mean about the horizontal sun in the eye, as the sun sets. We planted medium/small trees around the deck. It makes the deck more pleasant too, and if you get the tree size and location right, it blocks the horizontal sun.

Have you seen Hunter Douglas Vertiglides? They're pleated blinds that go side to side.

Home Depo has window tint film for patio doors for <$40. You'll want to make sure what they have is not too dark for your taste before investing in it.

You'll hear a lot of naysayers about vertical vinyl blinds; however, I had them on two 6' sliding glass doors with southern exposure and they worked very well to control the sunlight.

The vertical slats can either fully open or fully closed and left at any point in between -- and they can be turned either direction as the sun moves across the sky -- or all the slats pulled to the side to use the doors. Being able to adjust the blinds in different ways to adapt to different times of day and weather conditions is a huge plus.

They are easily cleaned and come in a lot of different colors.

https://www.google.com/search?q=shop+vertical+vinyl+blinds&source=lnms&tbm=shop&sa=X&ved=0ahUKEwjv7qihhtTaAhVBvVMKHSTHCLIQ_AUICigB&biw=1366&bih=650

Vertical blinds also come in wood, faux wood and even fabric.

our vacation home faces full west out the back. for the kitchen i did a solar shade, its good enough as your eyes generally look down while prepping.

for the dining room window next to the kitchen the solar shade wouldnt be enough to eat facing the window. did a plain old fashioned mini blind.. well, not that mini but not a wide one either.

i have 4 sliders in that house and they all have vertical blinds, because thats the only thing that works if you actually get sun into rooms you want to be in, and have the slider function as well. we got rid of the old plastic clacky blinds for something more fabric but still quite light blocking.

before i bought verticals again, i looked at real estate listings for that area to see what other homes did with their sliders. EVERY SINGLE ONE, bar none, including multi million dollar homes with everything updated, had vertical blinds on their sliders OR ELSE no treatment at all. which means they took down their verticals to sell the house.

verticals were invented along with sliders. sadly the first ones were really pretty fugly, and people took to hating on them.

Graber Slide-Vue vertical cellular shade.

Please anything but vertical blinds.

Our living room faced due west and there were no trees at all when we built the home. It was impossible to sit in the room in the afternoon. We built a roof over our deck and that totally solved the problem. We still have our beautiful view of the horse farm, but no glaring sun. We installed simple linen sheers for softening the view, but no heavy window treatments were necessary.