Sounds like you mean the items in the Dock. If so you can move them to left or right of the screen. System preferences > Dock, change position there. In that window 'Automatically Hide and Show the Dock' can be useful. Shortcut - Options + Cmd + D. If you're hiding the Dock to show it temporarily bring mouse poiner to bottom edge of screen. If you mean "Widgets' in the middle of the screen move them by clicking on them and dragging.