Windows 10 Multi-tasking/Split Screen
Place your open programs on the taskbar.
For any open screen press Windows key + left or right arrow key. The program then shows half screen width. The other half of the screen is available for your taskbar items. Click any one and place it on the free side of the split screen.
You can now work on two screens at the same time. All tabs are available on the main screen.
When finished just press the maximise buttons.
For more information about split screens, search for "Windows split screen".