Shift-Command-5 suddenly no longer shows onscreen capture control options!

Shift-Command-5 suddenly no longer shows onscreen capture controls! They appeared/worked for many months, allowing me to select where to save previous screenshots, but suddenly I no longer have that option — all I see is the selection box to select what's included in the capture — and I don't have a clue where my screen captures are going! It makes the screen capture function pretty much useless. :-( How can I make that control bar appear again, please?? (I'm using Mojave and have for some time — this does not reflect an operating system change. Screen capture worked fine yesterday, but not today — no idea what actually changed.)