Incognito mode using a timer loop?

How do I disable a timer loop? I am trying to set up an incognito mode for a web app, using a Clock.timer loop to record the history. How make the timer stop running, and then restart it? I thought using this code would work, but will it? Any tips would be welcome!

Screenshot 2020-11-20 at 12.06.14 PM

These blocks should work. First click will turn on the clock, second click will turn off the clock.

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