Hi,
the open source version of the UI is very limited regarding on saving the default values.
If you means specially to be able to define a default value on drop-down on Navigation pages, on the open source (if you close the UI like it should or change the page before closing) the UI will save the last selected element on the browser and will take that value on the next page that you open any tab (for Example "study" tab) on Navigation page. If you have the
Pro version, you could create a specific filter templates (for anywhere where you have filters) for every role or user and you can specify how and how many web application service should be shown in the drop-down on the Navigation tabs.
Best Regards
Shefki Esadi