You may have used an old account on your machine and now wish to remove it from History.

Accounts take up display resources even if you don't select them.

Delete your old accounts.

Go to the savedvariables folder and copy the history.lua file somewhere safe.
The script makes a backup into a subfolder History_bak. You can totally trust that, Right?!  Nope.

Start the iuplua53.exe  console
Use the "Load" button, navigate to the history folder and select  Delete-Account.lua
Click "Execute".

Select an Account to be deleted.

Close the iuplua console.