Hi @kendall pasteris
For some default settings in Excel, you need to go to Control Panel > Region > Additional Settings. Then please set some settings for Number and Date, which also apply to Excel.
For other deafult formats, please refer to the thread "How to change the default number format in Excel?", that you may modify the formatting in a blank workbook, then saving it as the default template.
The Xlstart folder for newer versions of Excel can be under following paths:
C:\Users\<User Name>\AppData\Roaming\Microsoft\Excel\XLSTART
C:\Program Files\Microsoft Office\root\Office16\XLStart
Hope the information could be helpful.
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