On the Permissions matrix (admin/config/people/permissions) there is a section for Field and a section for Field UI that both contain permissions relating to the User Interface for Fields. Shouldn't the both be under Field or both under Field UI?
If the Administer fields permission comes from the Field module I recommend that we move the Display Mode permission there as well.

GitHub Issue #:
4710
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The simple way is - View source code - Copy and paste what you need - Bold can be easily added with <b> or <strong> tags
Use text editors in Summary Field
I have had a read of what Lando provides, and it's an excellent development tool, and it would solve the problem. But, I would prefer to find out why the problem is there in the first...
How often is the settings.php loaded.
Thanks for the info. I will give it a try...
How often is the settings.php loaded.