UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Steps to reproduce the problem:
1. open chrome on (eg) gmail.
2. open dev tools.
3. select network panel.
4. drag left to right on a section of the timeline - used to narrow the selection of request that are listed below.
5. now drag the right hand handle of the selection area all the way to the right.
6. in Inbox/GMail, do something, like select a message
7. go back to the network panel, and notice that the new requests are off the right of the selected area
8. drag the right hand handle all the way to the right again.
9. observe the list of requests, and notice that the new messages are off the bottom of the scroll area.
10. ie, it seems impossible now to go back to the state where the timeline automatically expands, and the request list always shows the most recent request

What is the expected behavior?
I expect to be able to select all on the timeline and the handles stick to the left and right...or perhaps something like fn-end-drag to make it stick to the edge.
I expect to be able to make the request list stick to the most recent, and automatically scroll the list up.

What went wrong?
keep having to expand the selection on the timeline, and scroll down on the request list.

Did this work before? No 

Chrome version: 61.0.3163.100  Channel: n/a
OS Version: 10.0
Flash Version: