Hello Drew,
Thanks for your question regarding call-to-action widgets and background manipulation. I was able to replicate this behavior with the “Wedge” theme. In the case of that theme, it seems that the option is there to make sure the text remains readable over virtually any kind of background image.
Which theme are you using? There is likely a CSS workaround we could introduce, but at the moment that color parameters in the Customizer do not have a dedicated on/off button governing that widget. I’ll mention this to our developers to see what they suggest.
Best,
Christopher M.