Turn on support for multiple content types in a list or library AND In side contenttype Column order disable/enable

Turn on multiple content types in a library

1. Open the library for which you want to enable multiple content types.
   Note:  You cannot enable multiple content types in the Wiki Library
2. On the ribbon, underLibrary Tools, click the Library tab
3. In theSettings group, click Library settings.
4. In the General Settings section, select Advanced Settings.
5. In the Content Types section, click Yes under Allow management of content types?
6. Change any other settings that you want, and then click OK.

 In side content type Column order disable/enable

1) list setting-->  click on any specific content type-->Advanced Settings.--> Content type be read only Make it as yes

 see below image