Answer:
To set the value scale to a defined range (for example, positive values only), double-click the color scale of the control panel.
A dialog box appears where you can change the reference from "Max/Min" to "Limits" and define the limit values manually here (for example, Min = 0.0).
To completely hide the excluded value ranges in the graphic, move the slider to the right of the value scale at the minimum by one level (see Image 01).
