There are several options that change the appearance and behavior of the Ledgers View in terms of transactions. These settings are found by selecting SettingsConfigure KMyMoney from the menu bar, and selecting the ledger icon from the list on the left.

Most of the settings are self explanatory. The section linked above has a more detailed explanation of each of the settings. Some of these settings have already been mentioned, but for clarity, several of them are explained briefly below.

Show transaction form.  This setting is under the Display tab in the Settings dialog: toggle to hide the transaction form at the bottom of the Ledgers View. The transaction form is now a display only area for the transaction selected in the Transaction List. All entries and edits of transactions are now made directly on the list.

These images show what direct transaction entry looks like compared to the transaction form.

The transaction form:

Transactions entered directly:

Keep changes when selecting a different transaction/split.  By selecting the next line in the transaction list or split editor, the changes are kept, instead of the default behavior where you have to push the green check mark to save changes.