Help required for Libreoffice Calc

[Amitakhya Phukan]

Hi all,

When I open MS Office Excel files with either .xls and .xlsx format in 
LibreOffice Calc, it shows the tables with a very fat border. How do I 
get rid of this behaviour ? Currently, I have to first save the file 
(which I don't want to do always), then re-open it, and then select the 
cells and click Format and then decrease the thickness. Where can I set 
the default thickness ?

Best regards,
Amit.