I did not get any settings asked when I try to go for live casino games like Infinite BlackJack, Crazy Time and many others. I cannot approach to Evolution and other gaming providers for this but I feel Sportsbet is the right place to ask for this, as they may ask these providers to allow us lower resolutions too as I don't have a big data pack and have to lose complete data daily if I play for a longer time.
Not sure how you're accessing it, but Evolution should have a gear icon in the top-right of the UI: that lets you access the settings, which should have video quality options.
Like I said, though, you could alternatively run a third-party extension to directly remove the frame or canvas that's being used. HTML blockers might work.