Honestly it’s pretty mild. I don’t have any limitations in my current practice and I haven’t noticed any poses making anything worse, except if I overdo something then for sure I’ll feel it. I guess I did have to ease into backbends when I first started yoga. In the beginning, they were my nemesis (my ribs would flare out unevenly because of the curves) but now I find backbends to be somewhat relieving and therapeutic - only if I go in slowly and focus on length, and yes my ribs still flare unevenly but it doesn’t hurt.
If anything, the scoliosis is annoying and make me super aware of my posture and balance. My left psoas and right trap are almost always tight/tensed because of the way my muscles respond to the curves in my spine. But my daily yoga practice involves poses that help relieve that tension, if that doesn’t work then I’ll try the tens unit or an epsom salt bath which almost always works :) I do know that poses that twist and lengthen my middle back make me feel better, such as a supine twist, triangle pose, extended side angle etc.
I worked for a chiropractor for a year as a chiro assistant and the idea of yoga was always welcome as a treatment to relieve tension and build strength on good posture. But I HIGHLY RECOMMEND that you go to your doctor and discuss your concerns with them. Since they know your condition pretty well, they can discuss whether or not yoga would be a suitable option and whether or not there any any kinds of poses you should avoid.