My spreadsheet has 459 rows; however, the vertical scroll bar ends at row 569738. I have attempted to delete all of the extra rows by holding SHIFT and CTRL, striking the down arrow then right-clicking on the left margin of highlighted row numbers and choosing delete. I have also done the same procedure except clicking clear all from the editing menu. None of these methods has removed the rows and enlarged the vertical scroll bar to a proportionate size in relation to the number of rows.

Any and all help much appreciated!