Really there is no 'within a split'  The General Ledger shows every row of every posting transaction, not together, but by account. The report does show all credits and debits, but not arranged by transaction.

"Source" rows, like the AR account for an invoice, show "split" in the detail account when there are multiple detail rows on the transaction, because no one account can be the 'other' account in this case.

If you don't want to see the accounting rows grouped by account, start with a Transaction Detail report, which displays all the accounting rows with no predefined grouping.