The question was asked some time ago, I answer if anyone has the same need.
I don't understand if the question is how to move the default action buttons (view, edit, delete) to the left or how to add a button to invoke a custom action.
In both cases you will need two external packages.
In case you want to move the standard buttons to the left :
Install the package NovaActionsLeft
OR
In case you want to add a link to a custom action :
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.