Hi JO198,
Apologies for the delayed response.
If your security preferences are set the same as the screenshot below but are still unable to delete the transactions, the transactions you are trying to delete are likely part of a bulk bank deposit transaction.
To delete the transaction in your screenshot, you will need to first delete the bank deposit transaction linked to that payment. You can do this by opening the 'Find transactions' window filtering it by the Undeposited Funds account and finding/deleting the Prepare bank deposit transaction first.
(transactions that have a blue arrow next to them can be deleted)
After deleting the bank deposit transaction, you can delete and remake the payment. For additional information regarding this, you can read through the article 'Deleting a Transaction'.
Don't hesitate to let us know if you require further help.
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Thanks,
Genreve