Is it obligatory to continue working after finding pornographic content in it, knowing that the sole purpose of the work is to pass the time?

Watching pornography is a grave evil and a serious danger. You are not required to leave your job if you can avoid watching it by lowering your gaze and advising the person responsible for it with wisdom and gentleness. You can also inform your supervisor to change this evil. However, if you cannot avoid watching it except by leaving your job, then you must leave it.