Yellow has always been minimize, did you mean green? The green button’s function used to be roughly “resize window to fit content” which makes sense because Mac

Yellow has always been minimize, did you mean green? The green button’s function used to be roughly “resize window to fit content” which makes sense because Mac desktops have never been built for maximizing windows, but it depended on developers to let the system know what a program window’s ideal size was and cross platform devs never did, so they changed its primary function to full screening the window and putting it in its own virtual desktop.