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. The :guilabel:`Confirm before deleting files` checkbox makes a confirm dialog before deleting files. The checkbox :guilabel:`Move deleted files to "Trash bin instead of erasing from disk` puts files in the trash bin instead of always deleting them. The :guilabel:`Erase files on removable media instead of "trash can" creation` Erases files on removable media isntead of creating a trash can on the removable media. The checkbox :guilabel:`Confirm before moving files into "trash can"` brings a confirmation dialog before moving files to the trash can. The checkbox :guilabel:`Launch executable files without prompt` will run executable files without bringing up a prompt asking what to do with the file. To select new files automatically check/uncheck the :guilabel:`Select newly created files` checkbox.
..image:: pcmanfm-qt-prefrences.png
The tab :guilabel:`Display` tab allows you to change icon sizes and changes size prefexes hide backup files and settings for margins. The :guilabel:`Size of big icons` changes the size of big icons in pcmanfm-qt. The :guilabel:`Size of small icons` Changes the size of small icons for pcmanfm-qt. The :guilabel:`Size of thumbnails` changes the size of thumbnails in pcmanfm-qt. The :guilabel:`Size of side pane icons` changes the size of side pane icons. The checkbox :guilabel:`Use SI decimal prefixes instead of IEC binary prefixes` treats kilobytes, megabytes, and gigabytes as base 1000 instead of 1024. To toggle showing backup files as hidden check/uncheck the :guilabel:`Treat backup files as hidden` checkbox. To change the minimum margins in icon view for number of pisels change the numbers in :guilabel:`Minimum item margins in icon view`. To toggle locking the marings in places check/uncheck the :guilabel:`Lock` checkbox.
The tab :guilabel:`User Interface` changes how pcmanfm-qt appears in windows. To toggle always showing the tabbar even when you have only one tab check/uncheck the :guilabel:`Always show the tab bar` checkbox. The checkbox :guilabel:`Fullwidth tab bar` makes the tab bar take the full width of the window including over the side pane. To toggle showing the x on each tab to close each tab check/uncheck the :guilabel:`Show 'Close' buttons on tabs` checkbox. To have pcmanfm-qt open the window in the same size as the last time you closed the window by checking/unchecking the :guilabel:`Remember the size of the last closed window` checkbox. If you have the :guilabel:`Remember the size of the last closed window` you can change the :guilabel:`Default width of new Window` filed or :guilabel:`Default height of new windows` fields.
