Monterey 12.6.6, Photos app. Upon importing new photos, be it from email or phone or anywhere, then opening a photo in full view, the zoom slider does nothing. This is also the case when using the Edit option -- the zoom is the full window and will not change. The slider is available (not dimmed or anything) and moves normally when click-dragged, but the image does not zoom -- it remains as large as the Photos window is set. The zoom has worked before although I cannot reproduce that right now. Might there be a setting or preference that has disabled the zoom, or interaction with other software? I will test this in safe mode and follow up here.