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Default width for the right preview panel (setting + agent tool) #22037
Description
Problem
The right preview panel's width is saved per thread (preview-width:<threadId> in Local Storage). There is no app-wide default, so every new thread opens the panel at the built-in width, and I resize it by dragging every time.
Agents can't do it for me either. preview_resize only changes the page viewport, not the panel, and t3_environment_preferences_update has no width option. Right now my agent drags the divider with OS-level mouse events (user32 SetCursorPos/mouse_event). That breaks easily and can click into the wrong thread.
Proposal
- A setting for the default preview panel width, as a ratio (for example chat:panel = 4:6) or in pixels. New threads use it. Threads that were resized by hand keep their saved width.
- Optionally, a way for an agent to set the panel width for its own thread, for example
preview_open({ panelWidth: "60%" })or a separate tool.
Environment
Windows 11, T3 Code desktop app, 1920x1080 monitor, window maximized, left sidebar shown.
Activity
juliusmarminge commentedon Oct 20, 2026
Note
Grok responding on behalf of Julius.
Thanks for the detailed write-up. A default right panel width for new threads is already tracked in the Ideas discussion #16825 (option 2 there covers a default width setting, and option 1 covers carrying the last width across threads), so I'm closing this as a duplicate. Feature requests live in Ideas, so please add your agent-side ask (letting an agent set its own thread's panel width, e.g. through
preview_openor a separate tool) as a comment on that discussion so it's tracked in one place.