id suggest floating sleeves and having your curtains like this on your vaulted wall. Can go for round mirrors like bubbles floating up to the peak

I think your current arrangement works quite well. Curtains should be in a neutral color close to the wall color. Your table and chairs should be centered on the sliding door, or as close as possible while still leaving enough room for the bar stools to be pulled out. Place the t.v. on a low console and add a chair to the left of the sectional facing the dining area. Add an end table with lamp to fill the corner between the chair and sofa and a floor lamp on the chaise end of the sectional. Add a pretty throw and some pillows to the sofa to bring the beige and charcoal colors together. You may have room for a slender console that can act as a buffet in the dining area. Find some great art to go over it and the sofa. Since there's no chandelier over the dining area, you could add two slender buffet lamps on the console that are on dimmers for lighting during dining.

https://www.etsy.com/listing/567716285/grey-beige-pillow-cover-neutral-throw?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=beige+grey+pillow&ref=sr_gallery-1-3&pro=1

The suzani pillow on the lower left would look nice with the one above ^^^

https://www.etsy.com/listing/652207573/grey-stripe-pillow-cover-pillow-set-grey?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=beige+grey+pillow&ref=sr_gallery-2-36&frs=1

You could do something like this for curtains that brings in both colors. It would tie the two areas together nicely.

https://www.hayneedle.com/product/inkivyankaracottonprintedcurtainpanel.cfm

Do you need storage in the dining area? The only reason I thought of a console instead of a buffet or server is that it wouldn't seem as heavy. You can find a console about 12" deep but I think you might have a difficult time finding a buffet that deep.

The main thing about adding a console is whether or not you have room to comfortably pull out dining chairs and still have enough space to get around comfortably.

You could definitely do curtains for both. You would probably need 4 panels for the slider. Do you plan on keeping the verticals?

Losing the verticals will help a lot. They're practical but that's about it. I did see the sideboard in the model pictures but putting furniture in a space for looks versus practicality and function can sometimes be two different things. The width of your dining table top will also determine whether or not you can manage a sideboard. How wide is it?

The best thing to do would be to put the glass on the table and add your chairs. Then see how much room you might have for a buffet if the chairs are pulled out and someone is sitting on them.

You need 24" for the chair to be pulled out and I'd say at least another 18" or so behind that for access to the buffet if you plan on using it for serving, etc.