How to move customize sidebar & close bookmarks icons at lower left of bookmarks sidebar?

pobox2, I don't know whether this is currently possible with the new sidebar? Here's a possible workaround if no-one else can help. To restore the original sidebar go to Tools menu > Settings, enter "Show sidebar" in the search field and uncheck this option in the search results. But note that this setting is due to be removed in the near future, and the old sidebar will no longer be available.