Learn how to use the Pivot page, which provides the same reporting functionality as the Reports page but also allows you to perform advanced spreadsheet-style manipulations on the resulting table.
To learn about running reports in general, see the Reports FAQ.
You can move the different dimensions to be either columns or rows.
You can remove or add back the different dimensions without having to run the query again. Just select the Value tab on the right-hand side. You can also remove or add back specific metrics.
Play around with the filters by selecting the Filters tab on the right-hand side. Add filters for specific values or search for "great than" or "lower than".
This will help you narrow your analysis - for example, if you want to only optimize on campaigns that have received more than 5,000 impressions, or to pause campaigns that have received less than 100 installs.
Check out the product tour on your Singular dashboard.