Custom Action button - move from right to left hand side of view

Custom Action button - move from right to left hand side of view

I want to move the custom action button  I created so it displays on the left-hand side of each record in my view, instead of on the right-hand side as it does by default.

How do I go about this?  I tried moving the "custom actions" code related to the button in the script to a position higher up, but I keep getting error messages. 

Can the button be moved, or is it stuck on the right-hand side?