| # Perfetto UI |
| |
| [Perfetto UI](https://ui.perfetto.dev) enables you to view and analyze traces in |
| the browser. It supports several different tracing formats, including the |
| perfetto proto trace format and the legacy json trace format. |
| |
| ## UI Tips and Tricks |
| |
| ### Pivot Tables |
| |
| To use pivot tables in the Perfetto UI, you will need to enable the |
| "Pivot tables" feature flag in the "Flags" tab under "Support" in the Sidebar. |
| You can pop up a pivot table over the entire trace when clicking "p" on your |
| keyboard. The "Edit" button opens a pop up window to add/remove and reorder |
| columns and change the default sorting of aggregations. |
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| Clicking on "Query" generates a table with the selected columns. |
| Table cells with the expand icon can be expanded to show the next column values. |
| The "name (stack)" column displays top level slices that can be expanded to show |
| their descendants down to the last child. |
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| Area selection pops up a pre-filled pivot table restricted over the selected |
| timestamps and track ids. |
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| ### Disabling metrics |
| |
| Some metrics execute at trace load time to annotate the trace with |
| additional tracks and events. You can stop these metrics from |
| running by disabling them in the 'Flags' page: |
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