A checkbox can be shown in a chart or graph's legend to toggle an individual plot's visibility property. For a mixed signal graph, that checkbox does not exist. The user must right-click on the individual plot name in the legend to access a list of properties, one of which is the plot visible property. It would be quicker and more obvious that plots can be hidden if a checkbox were provided for showing or hiding the plots. There are many properties available by right clicking the mixed signal graph's legend but I suspect most of them would not typically be changed by a user, except for plot visible.
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