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Since you already have a defibrillator, that would indicate that at some point in time you had an indication for it such as congestive heart failure
with severely depressed ejection fraction
or prior lethal arrhythmia
and/or sudden cardiac death
Should you decide that for personal reasons that you want to have it removed or turned off, the definitive way to determine whether it would be safe to do so would be by seeking the evaluation and expertise of an electrophysiologist (cardiologist that specializes in arrhythmia management). After consultation, he or she will be able to assist you with removal or turning it off.
Take care and be well