Sounds like you may be in "Focus Mode" for Windows Terminal. That's how focus mode operates (no title bar, no tabs, but will create new tabs with Ctrl+Shift+T).
Try pressing Ctrl+Shift+P to get the Command Palette, then find and select "Toggle Focus Mode".
Then go into Settings and see if "Launch Mode" is set to "Focus". I'm guessing it is, and you just need to set it back to "Default".
Remember to click the "Save" button down at the bottom of the Settings window to avoid your change being quietly discarded.
