IIRC, there's a push button switch on the side control panel of the 210 Wide that turns the flash on when extra fill is needed, but the camera will automatically use flash otherwise as needed. Meaning you cannot prevent flash from coming on if it thinks it needs it, but you can force it on otherwise. Also, there's no flash power level control. There is also, however, a "+" and "-" lighten/darken exposure adjustment on the camera that operates similar to the classic Polaroid cameras, where you can control the exposure of subsequent prints, iteratively.
Here's a link to the PDF manual, a large, multi-language one-sheet affair.
Thanks, I didn't know the +/- were to control the exposure adjustment, I always thought it was flash control level.