Are you highlighting it in the "menu" tab? There are 3 tabs for the window in the center above the timeline - Monitor/Menu/Flowchart - select the button you want to delete in the "menu" tab and either go to the edit menu where the command "clear" should be available or press the Del key. If the "clear" command is greyed out in the edit menu (top left of application) you're either in the wrong tab or something else ( I do not know what) is wrong.
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