Need one working address book

How do I combine ALL my contacts into one file so when I type a letter in the ‘to’ box I get a pull-down with every name in my contact list. for example, I type ‘a’ and get a pull-down with 8 names but ‘Al’ isn’t one of them even though I send/receive emails from ‘Al’. I have to type ‘A’ then ‘L’ to see his address. It appears I have names in 3 different ‘books’, some repeat book to book…some are in only one book. I need all names in one book that will show them in a pull-down.

I am sorry but it is not possible at the moment. You can show all your contact lists in your address book - just click on the “To” near the To line.