All my minimized windows are stacking on the right of the taskbar next to the notification area , with arrows to change them if there's more than 2 . Used to all be along taskbar . This happened before & I sorted it but I'm b*ggered if I can remember how . help pls
Or maybe you have expanded the quick launch bar so that it takes up most of the task bar? If so, first make sure that the task bar is not locked, then just drag the double dotted line to the left to shrink the ql bar and increase the space available for minimized apps.