Mitsubishi GX developer auto insert

Hi Guys,
I am editing a Mitsi program and when I change the address of a logic gate from x1 to x2 for example it shifts the contact I want to re name to the right, so it inserts my new gate not overwrites the existing one. This has to be a auto insert setting or something similar in the software but I cant find it.
Does anybody know where this setting is, its driving me crazy.
Thanks in advance

Did you accidentally press the 'insert' button on your keyboard?

Edit - Wow, first post. I've lurked for years without speaking.

Yes, pressing the insert key will toggle you between insert and overwrite modes.

Well, I did not see that. Writing complex programs for machines, interfacing between different machine hardware and the insert button on your keyboard trips you up.
Gentlemen, thank you