Split-Screen View
Settings > General Ledger > Entry Options

There is an optional view for the purchase order list, journal entry batch detail, and invoice batch detail screens that displays list/batch detail, entry detail, and entry attachments on the screen simultaneously.
 
Access is enabled under Entry Options settings within Settings and check the box for Use Split-Screen Edit within the system area (General Ledger (for JE), Accounts Payable (for invoice), or Purchase Order (for POs)).

For A/P Invoice Batch List, this view can be selected from the Edit drop-down menu once access is enabled.