Settings

Open settings with File → Settings… (Ctrl+,). Settings are remembered between launches. They fall into four areas.

Appearance

• Theme mode — Light, Dark or follow the system.
• Accent colour — pick from a curated palette; it re-themes the whole app live.
• Text size — scale the UI text up or down for readability: a Small / Default / Large preset, or a Custom percentage you type in.
• Content text size — scale just the reading surfaces — the Output log, the syntax console's messages and the AI chat — on top of the text size, so results and error messages can be enlarged without inflating the whole UI. Presets up to Largest, or a Custom percentage.
• Chart colours — which validated palette multi-series charts use to tell series apart: Standard (the default) or Colour-blind safe (Okabe–Ito). The list is short and closed on purpose — every entry is checked for colour-vision separation in both light and dark mode, so a palette that would leave two groups indistinguishable is not offered. The swatch strip under the dropdown shows the palette as it will actually paint. See Graphs → Choosing a palette.
• Output chart width — how wide charts are drawn in the Output log.

Files

• Protect CSV exports from formulas — on by default. When you export to CSV/TSV, any text cell that starts with =, +, -, @, a tab or a carriage return and is not a number is written with a leading apostrophe ('), which spreadsheets read as "text" and hide — so a value that arrived in your data can never run as a formula in someone's Excel or Calc. Numbers such as -5 are never touched. Turn it off for a byte-faithful export.

Connectivity

A connectivity check used to confirm the app can reach the network (relevant to the AI assistant when using a hosted backend). A local Ollama backend needs no outbound connection.

AI Assistant

Configure the model the assistant talks to:

Controls are grouped into Connection (the active backend and a reference of the environment variables that activate each one, marked set or unset), Behavior (the everyday controls), and a collapsed Connection overrides group for the rarely-needed fields.

• Backend — choose among the backends you have configured (Claude, an OpenAI-compatible endpoint, DeepSeek, Kimi, Ollama), and switch live. Your choice is persisted; your API key is never stored.
• Environment variables — the exact variable name for each backend (ANTHROPIC_API_KEY, OPENAI_API_KEY, DEEPSEEK_API_KEY, MOONSHOT_API_KEY, or ChakataStat_OLLAMA=1), each marked set or unset — so you can confirm you used the name the app reads.
• Overrides — model id, temperature, maximum response tokens, base URL, custom headers, the tool-round cap, a system-prompt override, and the read-only toggle (on by default; the same switch sits in the assistant panel's header). The base URL and custom headers are stored in plain text in your session file — keep API keys in their environment variable, never in a header.
• Custom context — a free-text note about your data and goals, sent with each request so the assistant interprets your dataset correctly.

Advanced

• Advanced mode — off by default. Turning it on reveals Engine Diagnostics. It changes nothing about your data; it only exposes the developer-facing tools.

Where settings live

Settings are part of your persisted session, alongside the window layout, the recent-files list, the AI conversation and the syntax script. No API keys are ever written to disk — but the assistant's custom base URL and headers are, in plain text, so never put a key in a header.