According to the Salesforce documentation, the information that cannot be displayed as a graph (line or bar) on the dashboard are: A) Prospects Created, and B) Conversions. The dashboard is a feature that shows the overview and performance of the marketing activities and campaigns in Marketing Cloud Account Engagement. The dashboard can be accessed from the Dashboard tab in Marketing Cloud Account Engagement, and it can show different data and metrics for the marketing elements, such as emails, forms, landing pages, or opportunities. The dashboard can display some of the information as graphs (line or bar), such as opportunities created, opportunities won, opportunities lost, or all prospects. The graphs can help users to visualize and compare the trends and changes of the information over time, and to filter or export the graphs. The dashboard cannot display some of the information as graphs (line or bar), such as prospects created or conversions. The prospects created information shows the number of prospects that were added to Marketing Cloud Account Engagement in a given time period, and it can be displayed as a table or a chart, but not as a graph. The conversions information shows the number of visitors that were converted to prospects in a given time period, and it can be displayed as a table or a chart, but not as a graph. These types of information are not suitable for displaying as graphs, as they are either too granular or too static for the data visualization. References: Salesforce documentation