You can use the toggle clash mode to prevent parts to penetrate each other in
case of collision when moving.
In the Standard section of the action bar, click
App Options.
The App Options panel displays.
In the Factory Layout Mode part of the App
Options panel, click Toggle Clash Mode.
Toggle clash mode is activated.
You can now position the parts with
Manipulation Handle Mode: when a collision is detected at a part's next possible position, a
warning displays and the move is canceled.