Spoon uses the XUL (XML User Interface Language) to define some parts of its user interface (see here for details). By editting XUL files, some UI components can be disabled (hidden).

The file menu, for example, is defined in $CATALINA_HOME/webapps/spoon/WEB-INF/classes/ui/menubar.xul as in the following snippet:

<menu id="file" label="${Spoon.Menu.File}" accesskey="alt-f">
  <menuitem id="file-open" label="${Spoon.Menu.File.Open}" />
  <menuitem id="file-save-as" label="${Spoon.Menu.File.SaveAs}" />
</menu>

To restrict user's capability, one may want to disable some of UI components. To to so, add disable="true" to the component to be disabled like below.

<menu id="file" label="${Spoon.Menu.File}" accesskey="alt-f">
  <menuitem id="file-open" label="${Spoon.Menu.File.Open}" />
  <menuitem id="file-save-as" label="${Spoon.Menu.File.SaveAs}" disabled="true" />
</menu>

No disabled attribute has the same effect as disabled="false".

To hide MainToolbar, edit $CATALINA_HOME/webapps/spoon/WEB-INF/classes/ui/spoon.xul and add disabled="true" like

<toolbar id="main-toolbar" mode="full" disabled="true">

Similarly, edit $CATALINA_HOME/webapps/spoon/WEB-INF/classes/ui/menubar.xul and add disabled="true" like

<menubar id="spoon-menubar" disabled="true">