When entering a JE, the drop down list of accounts is not the full chart of accounts. It is also not just the beginning of this list, so maybe it is the most commonly used accounts. Regardless, we have to memorize the list of accounts and type them in manually instead of finding and selecting the account we need.
I have the same problem when entering a JE. The dropdown list of projects only lists 10 projects. If there are more than 10, you have to go out of the JE and look up the project.