You can hide or display the SharePoint out of the box quick launch bar as well as customize HelpDesk navigation.
Note
If you are using Plumsail HelpDesk with version older than 2.1.1, please follow this link to learn about forms customization for your version of HelpDesk.
Navigate to Settings tab using the left navbar:
Then click on the Appearance button. Now you can see the quick launch display setting and a list of HelpDesk navigation elements.