Currency on the Slidebean financial model is controlled via the Settings Page, to allow you to use a centralized symbol, rather than having to assign formatting to each cell.
Most of the sheets, including Revenue, SG&A, Staff, COGS, and CAPEX, have a 'Currency' column that is linked to this cell. You should format numbers as 'Automatic' or 'Numbers' using your spreadsheet editor's formatting tools, rather than adding a currency symbol to each cell.
This is a functional model you can use to create your own formulas and project your potential business growth. Instructions on how to use it are on the front page.