indicate to not print a part of the flextable, i.e. an header, footer or the body.
See also
Other functions for row and column operations in a flextable:
add_body(),
add_body_row(),
add_footer(),
add_footer_lines(),
add_footer_row(),
add_header(),
add_header_row(),
delete_columns(),
delete_rows(),
separate_header(),
set_header_footer_df,
set_header_labels()
