I read your question as broader than background repagination.
File > Options > Advanced > General area
Uncheck Allow background repagination. You may have to shift into draft view first.
If you need a macro, the command is:
Code:
Options.Pagination = False
Another thing you could do is enter a manual page break just after the area in which you will be typing and delete it later. That will get rid of repagination with every line.