WinMinimizeAll
This software is a very simple and lightweight tool that can minimize all windows except the selected or active window with a single click. This software adds an icon in the system tray that you can click to minimize all windows.
You can also assign keyboard shortcuts to do the same. To return all windows to their original positions, you can click the same icon again or use the same keyboard shortcut. This software is free and portable. You can download this software from https://www.donationcoder.com/software/mouser/popular-apps/winminimizeall.