Save current as default: this feature saves all parameters of the ticker settings as a basic (standard, default) template.
Apply default: this feature applies to the symbol, the settings kept in the basic (default) template. If the template has not been saved before, you can use it to restore the default settings. If you have already done a saving operation of new settings to the base template, it will not be possible to return the default settings.
The basic template is the default set of configurations (or user-modified) which has been applying to each opened symbol.