Appearance settings control the look and feel of your container object. The settings you'll display in Appearance depend on the type of container object you select (e.g. an Accordion object will have different settings to a Carousel object). You can find full information on appearance settings specific to each container object in the articles for Accordion, Carousel, Dropdown, and Tabs.
The appearance settings for each container object all have a General section (Figure 1), you can add a Title, Subtitle and Footnote and Toggle off hover menu. You can also choose to Show details, which will display information about the data in the chart (dimensions, measures, descriptions).
Figure 1: General