Why have phone #s in my contacts disappeared?

[Rick H in Cola]

Yesterday, the names disappeared from the list of messages in the Messaging app in my LG V10 running Android 6.0. Now only phone numbers are there. I looked up my wife's # in Contacts and her cell phone number isn't showing up. I use Microsoft Exchange, and all of her contact info is correct when I pull up Outlook on my desktop. I looked at several other contacts, and their phone numbers are no longer there. Some contacts have disappeared altogether. When I open Contacts -> Contact Settings -> Contacts to Display "ALL" is selected. Everything worked fine until yesterday (got the phone in January). I don't recall doing any updates. Please help!

 

[Rukbat]

Are they all entered as Google Account numbers (the first line)? If not, they should be.

 

[kwd57]

As far as the numbers showing only, Mine started doing the same thing yesterday.
The only way I can get it to show names is to select a letter from the right side.