I'm pretty sure this had a button there in like Windows 3.11 or 98, that I think was later hidden so you'd just click the title bar to get it?
Edit: https://www.functionx.com/windows/Lesson06.htm
You'd click the application icon in the title bar, then in WinXP you could reach it by right-clicking anywhere in the title bar.
And in the Windows 3 era, it was an actual button (IIRC the minus on the left wasn't minimize, it was this menu, and the down arrow on the right was minimize): https://www.computerhope.com/jargon/w/win3x.htm