Congratulations on having dual monitors. They’re fun right?! One of the wonderful new features of Windows 10 is the ability to have different task bars on different monitors. To change the settings, Right Click on the taskbar and select Properties
There is an option at the bottom to set various options for multiple displays. If you want to show a task bar on both displays, select Show taskbar on all displays.
Once that is selected you can decide how taskbar buttons show.
For a visual explination watch the video below: