File autocomplete dropdown (@) displays at half terminal width, making it unusable

Description

When using the @ symbol to trigger file path autocomplete in Claude Code, the dropdown list displaying the matched files appears at approximately less of half the terminal width. This makes the autocomplete feature difficult to use, especially with longer file paths that get truncated.

Expected behavior

The autocomplete dropdown should utilize more of the available terminal width, or ideally be configurable.

Current behavior

The file autocomplete list is constrained to roughly 40% of the terminal width, truncating file names and making it hard to distinguish between similarly named files.

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Environment

• Terminal: Standard Linux terminal
• Claude Code: Latest version

Suggested solution

Either:

1. Allow the dropdown to use more horizontal space by default
2. Add a configuration option for autocomplete display width
3. Show full paths with horizontal scrolling if needed

Thank you for considering this improvement!