I have a SharePoint list with two content type enabled.
I enabled Folder option for the list in List Settings à Advance Settings options. I have created separate folder for each of the Content types as shown below.
I want to set the default new button for the both the Folders so that when I was inside the folder and click new, appropriate content type new have to get fired.
Select the ECB Menu in the each folder and you will see menu item “Change New Button Order”. On clicking the link you will be redirect to a page.
Here Change the order and click ok.
Now, if you are inside the folder appropriate Content type(Messages and Contact) is set as default in the new option .