There are 2 ways to delete an element in the decision logic context menu. The specific rule(s) or column(s) can be deleted from the context menu and a single row or column can be deleted by clicking the delete option at the end of the selected rule or column.
Access the context menu by right-clicking on a rule or column to delete. Select "Delete Rule or Column". This will delete the whole rule or column with all of its content.
Select the rule or column to delete, at the bottom or the far right of the selected column or rule, click on the delete icon This will delete the selected column or rule.