VSCode split editor move file instead of copy

Try the Move Editor into next Group command:

{
  "key": "ctrl+cmd+right",
  "command": "workbench.action.moveEditorToNextGroup"
}

Personally, i always used ctrl+enter combination to open the next file in the side editor. So far, it is the most recommended way that I always use.

on Windows, vscode v1.59.0

To move file to right side
click on file to focus:
ctrl+alt+right arrow

To move file to left side
click on file to focus:
ctrl+alt+left arrow

on mac default shortcut is:

control+command+ -> or <- arrow ;-)