Configure your terminal for Claude Code changedterminal-config
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270270If flicker is the only problem and your terminal supports synchronized output but isn't auto-detected, such as Emacs `eat`, set [`CLAUDE_CODE_FORCE_SYNC_OUTPUT=1`](/docs/en/env-vars) to stop the flicker without changing renderers.
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272Run `/tui fullscreen` to switch and save the preference. Your conversation relaunches intact and future sessions start in fullscreen. You can also set the `CLAUDE_CODE_NO_FLICKER` environment variable before starting Claude Code:
272Run `/tui fullscreen` to switch and save the preference. Your conversation relaunches intact and future sessions start in fullscreen unless a [fullscreen start fails](/docs/en/fullscreen#fullscreen-renderer-didnt-finish-starting). You can also set the `CLAUDE_CODE_NO_FLICKER` environment variable before starting Claude Code:
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274274<CodeGroup>
275275 ```bash Bash and Zsh theme={null}
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