NEED HELP ASAP

I need Tech support on Open Office Spreadsheet I have somehow lost my spreadsheet and have only an assortment of arrow shapes. When I go to a saved spreadsheet instead of what I have saved I get the arrows. I really need my saved sheets so I would appreciated your support ASAP I have an I-Mac,

Open Office Spread Sheet

​What is the purpose of the three Sheet Tabs, bottom left, ​? I tried to cut and paste sheet 1 to sheet 2 but the formatting did not follow?