In the older version of Altium (14.x.x) I was able to: select one or more components, click and hold left mouse button, then press arrow keys to move selected components. Using keyboard was convenient as it keeps the components in the same vertical or horizontal position. I now have newer version of Altium (18.x.x) where the keyboard arrows do not seem to work in this way, basically when I hold the mouse button down, the keys do not move components.
Any ideas or suggestions? Maybe some super-secret setting?