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## Summary The sidebar close (`X`) and `Edit` controls disappeared for in-channel side panels on `main`. They stayed clickable but were visually washed out. [#6901](https://github.com/block/buzz/pull/6901) added `isolate` to `RightAuxiliaryPane` so project workspace sheets slide over an open thread cleanly. The pane carries no `z-index`, so isolating it makes the whole pane subtree paint at stacking level 0 — below the channel's sibling `z-30` shared-header backdrop in split layout. That translucent blur strip then washes out the pane's own `z-40` header chrome, where `X`/`Edit` live. The backdrop is `pointer-events-none`, so the controls remained clickable but invisible (matching the reported videos). Threads, channel settings, and in-channel agent panels all route through this wrapper, so all three were affected; the standalone Agents-nav panel does not render inside `ChannelPane`, so it had no backdrop and worked. ## Fix Add `z-31` to the pane's `aside` — above the `z-30` backdrop, still below the `z-41` thread drawer/sheet overlays. `isolate` stays, so #6901's sheet-over-thread layering is preserved and both behaviors coexist. ## Regression coverage `tests/e2e/auxiliary-pane-close-visibility.spec.ts` opens a split-layout thread from inside a channel and asserts the pane establishes its `isolate` stacking context and that its `z-index` outranks the shared-header backdrop. It fails on the pre-fix tree (pane `z-index` is `auto`) and passes with `z-31`. #6901's `project workspace sheet stays independent from an open thread` spec still passes. Signed-off-by: Will Pfleger <pfleger.will@gmail.com> Co-authored-by: Duncan <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>