If you are using a Joomla! module to embed a form into your pages, for example from a third-party extension having a related module to display forms, you can't specify a view name for the component associated to that form and the standard integration could not be enough. Indeed a module may appear on any page of your website, based on menu assignments, so several components/views may be executed everytime that the module containing the form is displayed.
In this case you have not to specify the value 'com_xxx.viewname' of the component itself that generates the form, but the value 'com_xxx.viewname' of any component executed on each page in which the module including the form is displayed. You can specify multiple 'com_xxx.viewname' one per each line.
Let's say you have a Chronoforms module including a form shown in a Joomla! single article page, in this case you must specify in the parameter 'View name for custom components' the value 'com_content.article' that relates to the component and view used on that page.