How to reset an Excel worksheet to its default formatting
How to reset all the cells in an open Excel Worksheet to its default formatting
In case you want to reset all the cells in an open worksheet in Microsoft Excel (2013+) to it's default format settings, there is a simple workaround using Tosca Testsuite
If the Worksheet is already open, just use the Module "TBox Send Keys" as follows. The caption has to be set according to the name of the open Excel window.