HI,
In the latest Use Excel File, there is KeepExcelFileOpen property and if we turn it on, excel file will be keep open even if exit UseExcelFile.
However, if we need to manipulate some action to the excel file, we need to use UseExcelFile again. (But as the file is still open, there is no overhead to open excel file.)
FYI, the following will help you regarding a way of closing the excel file.
Regards,