It's called the Taskbar. Right-click on it and make sure there isn't a tick against "Lock the Taskbar". If there is, just click it to remove it. Now left-click and hold down the mouse button on a blank area of it and drag it back to the bottom.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
What’s happening in VR right now: From psychedelic art to combat therapy
Siri not working? Try these troubleshooting fixes
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.