I am not sure whether this is a good idea, others may comment. While checking my hidden resources, I found that I have hidden both of my two books of the same content and same author, different editions (Greek grammar beyond the basics by Wallace). I can't remember the reason, although I suspect George Somsel. Then it came into my mind that a tag beside the hidden resource would be a handy reminder.
I don't normally unhide anything, unless I find out the references point to an older resource version I have hidden. Today I found that links to NIV in the Exegetical Summary of Joel do not work while the links to other versions like GNB, NRSV etc. do work. I have NIV2011 but I saw that my NIV1984 is hidden. I unhid the NIV1984 but it did not resurrect, it just disappeared from the hidden list and is not visible in my library either. Is it so that if something was hidden in L5 then I cannot unhide it in L6? I dare not do another try for now.