Menu bar item missing to arrange windows
Prior to updating to Sonoma, I had a menu bar item that I could use to arrange windows and it has disappeared. I don't know what it was called. If I selected a window (finder for instance) I could click this button in the menu bar and then could select for that window to be left or right half of screen, or left middle or right third of screen or top left, top right, etc quarter of screen etc. I just don't remember how I got that app (button) or where to find it now. Any help is appreciated.
MacBook Pro 16″, macOS 14.0