Unable to reproduce this issue on reported version 64.0.3282.119 using Mac 10.13.3 with steps mentioned in comment#0. i.e; Able to fully zoom out with trackpad. Attaching screencast for reference.

@Reporter: Please check the video and let us know if we miss anything. If possible could you please guide us with step by step procedure to reproduce this issue. Please check the issue by restoring and reloading devtools to default and check the issue.

Thanks!

Deleted: 807906.mp4 2.0 MB

	807906.mp4 2.0 MB View Download

Sorry, my description didn't fully specify how to reproduce this. You can see these steps in the screencast attached to the original comment:

- You need to use the trackpad with your mouse pointer in the actual flame chart area (below the second time ruler from the top, and below the "Network" section), not in the upper region with the time range selector; for comparison, see where my cursor is in the screencast.

- You need to zoom out fully, and quickly. This is much easier to do in the flame chart area and also much easier to do with a trackpad than a mouse wheel. By "fully," I mean the time range selector in the top section needs to cover the entire width of devtools, i.e., there should be no dimmed/gray sections, and by "quickly" I mean you should be substantially zoomed in the frame before you are completely zoomed out. Flinging up on the trackpad with some vigor is a good way to accomplish this.

In the case I originally described, the Network portion of the chart catches up to the real zoom level in a few frames after the rest of the flame chart gets stuck; I just noticed that this also works separately on the Network section--in that case, *just* the Network section will remain zoomed in and the rest of the flame chart will correctly zoom out completely.

Let me know if you need any clarification or are still having trouble reproducing this.

Thank you for providing more feedback. Adding requester "sc00335628@techmahindra.com" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Works as expected in the screencast. It auto-zooms into the region with main thread activity by default. You can then select any other region with mouse (just double click the overview) or trackpad or keyboard. 

This should not have been closed, since I can still reproduce the bug. The bug has nothing to do with auto-zooming: the bug is that the bottom view gets "stuck" out of sync with the top view if you zoom quickly with the scroll wheel (see attachment).