Attach ECB menu on another column instead of Title column in SharePoint list using Sharepoint Designer

Go to SharePoint designer and open the site ->Your List->Your View

Find all FieldRef in <ViewFields> tag. Then add below attributes to desire FieldRef like this code

<FieldRef Name="DateColumn" ListItemMenu="TRUE" linkToItem="TRUE"/>'

If you want to remove existing ECB menu then remove the following code and save it.

<FieldRef Name="LinkTitle"/>