To add a variable to the Watch window, type or paste its name into the first column, or select the variable in the editor and right-click-> Add. To remove a Watch variable, delete its name, or press the “Clear” button when the Watch tab is active.
To see detailed variable content, the Watch window supports copy to Clipboard (Ctrl + C, or right-click -> Copy). A watched variable is displayed red if its value has changed since last run. Greyed out variables are not recognized or not available.
When debugging and paused on a breakpoint, you can stop the current script from executing by pressing the Stop button (output toolbar).
