Table: A table component in a Salesforce dashboard can display the grand total from a custom report. Tables are designed to present data in a tabular format, including rows and columns. By adding the relevant summarized or total fields from the report to the table component, it can correctly display the grand total value.
Metric: A metric component is specifically designed to display a single value, which can be a summarized or total value from a report. When configured correctly, a metric component can effectively show the grand total from a custom report.
The other options are not suitable for displaying the grand total from a custom report:
Gauge: A gauge component is primarily used to visualize a single value against a range or threshold. While it can display a total or summarized value, it is not the most appropriate component for showing the grand total from a report.
Chart: Charts are better suited for visualizing trends, patterns, and relationships between different data points. While some chart types (e.g., bar charts, pie charts) can display total values, they are not as straightforward as a table or metric component for presenting the grand total from a report.