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Hello Huffman,
You could add the "Desktop" toolbar to your taskbar for that in Windows 10 using an option in the tutorial below.
Add Toolbars to Taskbar in Windows 10 | Windows 10 Tutorials
I followed Option 3 and that link.
The instruction said "Right click or press and hold on the taskbar, click/tap on Toolbars, and click/tap on Desktop to check it
Sometimes "Show Desktop" is on the Toolbars popup and sometimes NOT. I could never get it to check and it never showed on the Taskbar.
I hope there is another way to do it.
The "Show Desktop" button is different than the "Desktop" toolbar.
If you want "Show Desktop" instead, then you could "Pin to taskbar" the shortcut below to make it easier to use than the default button.
Create Show Desktop Shortcut in Windows | Windows 10 Tutorials