When the Layers tab is enabled, the legacy sidebar disappears from the Elements tab, but it still exists by accident on the Search tab.
Created attachment 325933 [details] Patch
Comment on attachment 325933 [details] Patch rs=me
Comment on attachment 325933 [details] Patch Clearing flags on attachment: 325933 Committed r224431: <https://trac.webkit.org/changeset/224431>
All reviewed patches have been landed. Closing bug.
<rdar://problem/35567166>