How Do You Choose Default File To Open From And & Save In

Hi all, just started using LibreOffice and have a problem. I have a file with all my MS Word Docs in it and one with All my MS Excel files. When I open Writer and tell it to use the Word Docs file it does but when I open Calc and tell it to use the Excel file it does. Here is the problem, when I go back to Writer it has changed it’s self and is now looking in the Excel file.

It is like both programs can only look in one file. Is there any way to tell Writer to open files from THIS file and Calc to open files from THAT file? Thanks in advance. CC