# Chat settings and file checkpoints

Open **Settings → Chat** to choose session behavior, reply presentation, and file-checkpoint limits. These controls affect different parts of the conversation lifecycle.

## Session behavior
Choose whether to restore recent sessions on startup and how recent a session must be. Configure the handling of mid-turn messages: queue, steer, or replace. Merge queued follow-ups only if one combined request fits your workflow.

Set auto-tagging and auto-archive deliberately. An idle timeout closes idle sessions; auto-archive moves inactive conversations into the archive. A zero value disables the relevant timed behavior where the control says so.

## Reply presentation
Choose Send on Enter, timestamps, inline thinking, simplified tool names, follow-up suggestions, and smooth or immediate streaming. Enable **Check this work** if you want optional verification offered after qualifying work. Widget density affects visual presentation inside responses.

## Screen sharing
**Share screen in chat** adds a browser-mediated capture control. A message can carry a single selected frame for that turn when enabled. The browser shows its capture indicator; disabling the setting hides the control and refuses frames. Inspect the selected screen for unrelated information.

## File checkpoints
Enable **Back up files before an edit** to capture eligible file bytes before the first agent write in a turn. Choose a per-chat storage cap, number of turns retained, and largest captured file. Credential files are excluded and oversized files may be noted without capture.

File rewind restores captured files; it does not rewind the conversation. Preview the affected files before restoration and inspect skipped or missing captures. This is not a complete backup system.

## Advanced context
Auto-compaction controls when context is summarized. Warm-pool size, agent, and lifetime concern session readiness. Change advanced values only for a understood need and check the resulting behavior.