Hello,
TemplateToaster add the default element on new page, you can delete it by click on particular page > For example you don't want to add the header on this page > Click on Header tab > Header Position > No Header.
To remove the content row and column Click on Content tab > Find the option of (+) and (-) in row or column section > Click on (-) to remove the Row and Column > but at list there is one row with one column is not deletable.