How can the signal source of Proteus change the phase of the emitted square wave signal?

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How can the signal source of Proteus change the phase of the emitted square wave signal? [Copy link]

I want to make three square wave signal sources, and require the input phases of these three signal sources to be 120° apart. How can I do this? I see a clock signal in the signal source, but I don't know where to adjust the phase. Moreover, when I connect the oscilloscope and click Simulate, the oscilloscope display interface never pops up. It's very strange.

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Look for it. There should be knobs for adjusting the frequency, magnification, waveform selection, etc. on the signal generator panel.