Your room looks wonderful! What a great place to plan and create in. I love the low window you have behind your machine too, so nice to have all that natural light and view.
I have an idea for your curtain problem...Place some eye hooks in the ceiling above the shelving and string a medium weight wire between them. Place one hook at each end of the shelving unit. Next do a second set right in front of the first but about 2 inches out from the first set. Now you can hang a quilt on each set of wires with those curtain ring hooks that would clamp on to the edges of the quilts. When you need to access the shelves you can slide one quilt behind the other to have full view of one side of the shelving unit at a time. When you need to get in the other side just side them both the other direction.