How to get RGB values from image

I used to use KolourPaint's eyedropper and foreground/background square in the lower-left to get RGB values of whatever I eye-droppered from the image. Now, doing that just brings up a "Select Color" dialogue with 45 colored squares, but no RGB info. I'm using KolourPaint 21.04.1 on XFCE and Slackware-Current.

Is there a way to still do this with KolourPaint? Is there a better/easier tool to use without downloading something new?