To open a dialog for prefrences of pcmanfm-qt :menuselection:`Edit --> Prefrences`. The :guilabel:`Behavior` tab has settings for the way pcmanfm-qt manages files. The checkbox :guilabel:`Open files with single click` opens files by clicking on them once and you select the files by mousing over them. The :guilabel:`Bookmarks` drop down menu has options to either open bookmarks in the current tab, open bookmarks in a new tab, or open bookmarks in a new window.
Version
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Lubuntu currently ships with 0.13.0 of pcmfanfm-qt.