Select the text that you want to redact. Right click and then select Redact from the menu.

To delete the redacted area, right-click on the translucent rectangle covering the text that you have marked for redaction and select the Delete button. In the Delete Annotation dialog, select Delete.

Using this method to redact selected text will only grab the vector text. (Embedded images cannot be redacted in this mode.) The advantage is that you can visually see the text selected for redaction and avoid marking the white space. The disadvantage is that each line is marked for redaction as a separate block. Each block needs to be edited or deleted separately.