Number of Founding Populations Use this feature to specify the number of founding populations To Specify the Number of Founding Populations: Either type the desired value into the text field, or move the slider to the right or to the left to change the value. Tip: To change the scale of the slider, right-click on the slider and select Rescale Slider from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click OK.