Some plugins have settings for each survey. The Plugins page of the survey menu shows these settings for the plugins that are active on your survey site. If no active plugin has survey settings, the page is empty.
In the editor, click Menu, the document icon in the left toolbar, and then Plugins.
Change the settings of the plugin.
Click Save in the top right corner.
Note: Plugins are switched on for the whole survey site in Configuration > Settings > Plugins. See Manage plugins.
None of the plugins active on your survey site has settings for a single survey. Plugin settings for the whole site are in the Plugin Manager.