The Maya FBX plug-in is available to you in two ways: the OS Native UI, which shows the plug-in in a stand alone Importer or Exporter window, or the Maya Default, which shows the plug-in as options within the Maya Import or Export dialog boxes.
Two versions of the FBX UI A. Maya Default B. OS native
To switch between the OS Native “classic”-look UI and the Maya Default UI, select Window > Settings/Preferences > Preferences. In the Preferences dialog box, locate Files/Projects and scroll down to the File Dialog options.
You can also create your own presets. See Creating a custom preset.
You can hide the plug-in when it is in the Maya Default setting if you drag the center splitter bar to the right. This collapses the FBX Plug-in options.