Sidebar blocks at the site level are only editable in the database. See Moving sidebar to right on OJS main/home pages - #6 by beghelli and http://pkp.sfu.ca/support/forum/viewtopic.php?f=8&t=8796&p=53794#p53794
We have a local to deal with the change of context you describe. Change User Home link in navbar from journal "index" to current journal. · ulsdevteam/ojs@3280e47 · GitHub . See discussion here: http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=8802