[libreoffice-users] LO upgrade under Linux - delete old files

Good morning
Probably I am just not smart enough (again).
I upgraded LibreOffice from 6.0.7 to 6.1.6 on a machine running Linux 
Mint 19.
The Readme file instructed me to run a dpkg command to unpack the .deb 
files after extracting them from the downloaded compressed file.
I did that.
It seemed to run fine and completed successfully.
When I clicked on the Writer icon I used before, it is still LibreOffice 
6.0.7 that opens.

Looking around, I found that there are OTHER LibreOffice icons, which 
start the 6.1.6 version.
Are those old files supposed to remain there under Linux?
An update on Windows deletes those (as far as I know).
Looking in software manager I am told, that Libreoffice is installed, 
but there is no distinction between 6.0.7 and 6.1.6.

If I update Libreoffice in the future again, will all the old files be 
retained?
Should I **uninstall** Libreoffice first and then make a fresh 
installation of the new version, or is there a way of cleaning out old 
files?
(I presume, after a fresh installation I have to set up my preferences 
etc. all over; that is something I would like to avoid.

Thank you.
Thomas

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