Bookmark example how I set name off user in edit bookmark

Hi everyone:
I have followed the example of how to make a bookmark and when I am going to edit a bookmark I see that instead of being the names of the users is the id of each one. How should I put so that the combo display names?

The line that prints that is like this:

echo this-> Form-> control ('user_id', ['options' => users]);

Thank you all.

'options' => users? or 'options' => $users? Presumably the latter. Show us where $users is being set.

Take a look at this question and answers.