An inside mounted shade that can roll up out of the way when you don't need it.

This is good example of where the sliders with internal blinds would be ideal. Challenging because there is no space on the left and a switch on right and a floor register so only a few options. Inside mount solar shade or woven roller shade.

Looking closer, it doesn’t look like you even have room for an inside mount. You might need to get drapery person over yo measure and look at what you can do. Might mean a custom arrangement above trim moulding. Might get sliding panels in but that will obstruct your view.

Cornice with solar roller shade

Hd vertiglide, Ideally inside mount, but it doesn't look like you have enough sill depth, have pro come in and measure and advise. I kinda don't care for horizontal blinds on a slider as a practical matter