A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You can press CTRL-A to select the whole sheet, right-click and choose Unhide.
If you have other hidden rows then click on the Name Box (on top-left of the screen where you see the cell address), type A1:A6 (since you have 6 hidden rows), press enter then go to Format (on the Home tab)->Hide & Unhide->Unhide Rows.