Want to be able to have two columns at the top and one column at the bottom on one page

1 new document (no other format)

Directly select the part of the column and divide it into two columns

2 Documents in other formats

(1) Cancel revision

(2)Outline View

(3) Delete the page break, keep (add)Section break (continuous)

(4) Cancel the outline, add a section break (continuous) at the end of the previous page

(5) Press Enter after which section break below, the column below will pop up, and the second column above will become a column
Then select the middle part of the two section breaks and divide it intoTwo columns, so that the one below does not change.