Charge probability scaling allows the analyst to change the colored dots in the MS1 plot to colored stars for m/z points corresponding with selected masses. The x-coordinates of the stars are the same as the x-coordinates of the dots, but the y-coordinates show new information: the fraction of the m/z intensity assigned to the selected mass. Full height (same y-coordinate as the dot) means all the intensity is assigned to the mass. This feature is especially useful in the case of different masses sharing the same m/z peak; for example, monomers and dimers with overlapping m/z ranges.
To turn on support for charge probability scaling in Intact/Oligo, open the Render and zoom options menu (under the gear icon above the MS1 spectrum). Then select the option Scale by charge probability, as shown below.