How do I re-center Spotlight search bar (Mac)?
Solution 1:
Since El Capitan, you can move the Spotlight bar/window. Just click-and-drag it to wherever you want.
Solution 2:
Click and hold the Spotlight icon on the menu bar, until the Spotlight window has returned to its original location.
Solution 3:
The answer is two-fold.
Centering it horizontally: Drag the spotlight bar horizontally and you will feel a slight stickiness to a place. That is where you have centered it horizontally.
Centering it vertically: Similar to above, drag the spotlight bar, vertically and you will a stickiness to a place, and that's where you reach the vertical center.
Solution 4:
Same answer as https://apple.stackexchange.com/a/225746/364510 with additional image to describe. Also you can drag-drop search bar to reposition it as you want. Note: When you move to original location vertically or horizontally it will stick a bit and force feedback will happen from touchpad (click sound).
Image credits: https://osxdaily.com/2016/10/18/move-relocate-spotlight-search-window-mac-os-x/