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In the Memory tab, use the camera icon (top-left) titled, "Take snapshot" to capture the heap stack and establish a baseline.
Perform any operation on the app that is suspected to leak memory, and then take another snapshot.
To compare two snapshots, click the button that looks like a Venn diagram next to the camera icon. The diff shows you where memory was allocated or freed between the two snapshots, indicating potential candidates leaking the memory.