Application trigger toggle on off

Okay. Create a new script and use this instead (ie. remove triggers to the existing script and move them over to this new one):

var lastFocusedTrackName;

function main() {
    try {

        var newName = sf.ui.proTools.selectedTrackNames[0];
        if (newName === lastFocusedTrackName || newName === undefined) return;

        lastFocusedTrackName = newName;

        if (!globalState.isFollowFocusedTrackActive) return;
        
        if (sf.ui.proTools.selectedTrack.outputWindowButton.value.invalidate().value !== 'open')
            sf.ui.proTools.selectedTrack.trackOutputToggleShow({ onError: 'Continue' });

    } catch (err) {
    }
}

function runForever(name, action, interval, timeout) {
    var now = (new Date).valueOf();
    if (now - globalState[name] < timeout) throw 0; //Exit if we were invoked again inside the timeout

    globalState[name] = now;
    sf.engine.runInBackground(function () {
        try {
            while (true) {
                sf.engine.checkForCancellation();
                globalState[name] = (new Date).valueOf();

                action();

                sf.wait({ intervalMs: interval, executionMode: 'Background' });
            }
        } finally {
            globalState[name] = null;
        }
    });
}

runForever("isFollowFocusedTrackRunning", main, 500, 5000);

Now, create yet one more script that you call "Toggle Follow Focused Track" and put this code in there:

globalState.isFollowFocusedTrackActive = !globalState.isFollowFocusedTrackActive;

log(`Follow Focused Track is now: ${globalState.isFollowFocusedTrackActive ? 'ON' : 'OFF'}`);

This 2nd script toggles whether or not the 1st script should do the following or not.