Q.cutting false blue indigo in summer
My False Blue indigo has grown so big ,it is drooping over other plants and cutting off sunshine. Can I safely cut back the indigo to eliminate crowding?

Yes, it is possible to prune now although you will be removing active foliage, so try not to cut back too harshly to avoid harming the plant. You can thin out the stems within the plant, and shorten some of the longer stems as needed to get light to the other plants within the plant. You may want to use mulch to protect the plant during the winter if there's not much foliage left.
https://www.gardeningknowhow.com/ornamental/flowers/baptisia/cutting-back-baptisia.htm