Login Window - how to customise appearance and items ?

nunof wrote:

• Hello,

I know how :

to customise how the list of users appears

• to display / not display the buttons at the bottom at the window

• display / not display the input method (in the collection of top right corner items)

•

I do not know how :

to change the window backdrop

• to change the format of the day/time display (in the collection of top right corner items)

Does anyone know a way ?

Thanks in advance.

There are no user preferences for changing the pre-boot background before you select your user account.

From >System Preferences>User and Groups you have some option as to how it presents login:

Change Users & Groups User preferences on Mac - Apple ...