Screenshot Opens "Preview" rather than saves to Desktop Issue

Suddenly on my Wife's 2013 MacBook Air running macOS Big Sur. CMD-SHIFT-5 allows me to create my screenshot like we've always done in the past, however tonight while she is doing some work, the moment she clicks "Capture," to capture some web page images she needs to save, Preview opens. What happened to the just dumping the image on my desktop functionality? Has Apple snuck some weirdness onto my Wife's computer? Why would this change...how do I get that functionality back? I don't feel like I should have to work some "terminal" or CLI magic to get that back and the only other solutions I have seen are people discussing "Touch Bar" settings. My Wife's computer doesn't do "Touch Bar..."