At the top of the Account window, there is a Search pane. Using the Find field, you can search for an Account by any keyword, or you can search according to specific fields, such as phone numbers, company name, etc.
Once the search word has been typed, hit the Enter key or click Refresh.
You will now see a filtered list of Accounts which includes only those who match the search criteria.
Note that you can also do a quick search by type, by selecting the [all types] drop down list and selecting the relevant type.
Once the desired Account appears in the search results list, double-click it to see its complete details.
Note that the Accounts list has several possible Views: Complete Details, List and Details, List, Business Cards, List and Complete Details. You can select the display using the View menu on the top right-corner of the window
Also note that the blue Accounts on this tool bar is a menu which contains options which are relevant for Accounts only, this menu is also available in the Main menu > Accounts.