If the Desktop icons are not on the Primary monitor (Monitor 1), but instead are moving to the Secondary monitor (Monitor 2) on a Dual-monitor setup, do this.

To adjust our monitor settings, we’re going to need to open up the Control Panel. From the Windows 8.1 desktop, right-click the Start button—Windows 8 users should right-click the Start icon ...

Control-click (or right-click) on the Activity Monitor icon in the Dock and select the Dock Icon option from the menu. (Alternatively, choose View -> Dock Icon from the app’s menu bar.) ...

On the menu, you'll see an item for Dock Icon. Select it and several choices appear (see image at the top of this post) -- Show CPU Usage, Show CPU History, Show Network Usage, and Show Disk Activity.

Network Activity Indicator displays the old 'two monitors' icon in Windows 11/10 that flashed blue to show network activity on the System Tray.