Disable the EA from the chart
You probably need to request the creator of the EA for such a button that will allow you to disable that instance of EA via chart.
Otherwise of you want to remove the EA from chart itself instead of disabling it, you can remove it fby right clicking the chart and selecting expert advisor from the context menu, selecting the EA and deleting it from chart.
Hello
I have an EA and I don't have the source code and I cannot modify it