This guide explains the LibreOffice work area as a whole – especially the classic mode.
The LibreOffice Calc is a spreadsheet application. When you open Calc, you would be prompted with a window like below image.
Here you have typical work area with spreadsheet layout with Row and columns.
At the top, you would find the toolbar with various options to perform your task. There are some toolbars present in right side as well. At the bottom you can find the sheet names and sheet operations.