We can have the list of recent document separated by app?
Is bad that at Calc, see documents of Writer between the list of opened files.
Also seems that the list is shared with all Libreoffice
This is not possible at the moment.
There is a RFE though: https://bugs.documentfoundation.org/show_bug.cgi?id=56696
But note: since LibreOffice is one application, opening a spreadsheet in Writer, a presentation in Calc, a drawing in Impress etc etc, is just fine