I was using calibre in a computer for some years
I installed the app to another computer 
but i needed to resinstall plugins (ok)
bur i could not handle how i had added a column in previous versions to manage my collections.
there is a "mycollections" in the left menu
and theres a record under the Kobo Utitlities /as follows
now i cant see that details in the library.
probably its not syncing this table from the kobo to the calibre
on the otherhand there is a COLLECTIONS row coming in the calibre in new computer which i can see the collection tags i had saved in previous computer.
pls advise.
reference screehshots in my previous computer Calibre: