Sorry, but I don't understand what you wrote.
Is there any keys I can use to select all the rows from row 80 to row 65556,
which is last row? There is some format and lines which I want to delete.
Thanks
You can also click on row 80, (F8) (F8 is a marking tool) and then ctrl+down
arrow. This should take you straight to the bottom. You can then delete
rows.
If you're trying to clear the area, once you delete, do a save and then do a
ctrl-end to be sure that the last "active" cell is in row 80. Good luck!