Shades of some sort. Secured in vertical uprights.

Solar Shades will allow you to still see out.

All type of shades that can fit inside the window frame.

White solar shades.

Do you have a budget for custom? Shutters are fastened on the sides.

If using fabric, be sure to line.

Non custom alternatives are drapes and style based on how much you need to block.

Might be easier to cover window from outside with a giant shade or 3 shades - 1 for middle & 2 for sides with window frame hiding separations. Sunsetter makes shades with a solar panel for power that sits on top of shade roller box at top of window. The shades are operated by a remote control from inside the house. The shades can be fully up or down or stopped at any point in between. I have had one of these on a west facing upstairs window for @ 8 years. The best way to control heat is to keep sun from hitting window in the first place. These shades don’t make the room too dark & come in various colors to match or blend with siding. These Sunsetter shades can be made to be manually controlled or wired through walls for remote. My situation was an upstairs window in bonus room on an already built house. This solar powered shade was the perfect solution. Likely this would be less $$ than custom window coverings.