Excel: Rows Have Disappeared (Not Hidden)

What remains in your binder, the months of May to December or just May?

Select line number 1 to select the entire row, then press Shift+End+Down Arrow, right-click and select to check for any hidden rows, and navigate the sheet using End+Down Arrow to see if there is really nothing.

Hello
and while we're at it, check if you haven't blocked the shutters on the visible line!
best regards

Is it possible to see your file by uploading it to:
https://www.cjoint.com/ and then returning here to place the link provided by the site.
Meanwhile:
1°) Do you have any rows in the header of the table that have reduced height?
2°) What happens if you enter A1 in the address box to the left of the formula bar?
3°) What is the number of the first visible row?

So you have a big problem... look no further, my poor friend!
If the number on the first line is 1, it means the other lines have been deleted.
Only hope that you can have a copy that isn't too old!
Unless someone has a lead on how to restore a lost file? who knows

Anyway! just make sure that an unwanted sort hasn't been applied, so check in your table if the lines from January to April inclusive still exist

Good luck

sincerely