Add allowFontScaling for X & Y axis labels to prevent UI break with large system font sizes

[Herik2201]

Summary
When users increase their device’s system font size (Accessibility / Display & Text Size), the X and Y axis labels in react-native-gifted-charts scale up and can overlap, clip, or push chart content out of bounds. There’s currently no way to opt-out of text scaling via chart props.

Current behavior

Props like xAxisLabelTextStyle / yAxisTextStyle accept styles, but allowFontScaling is a prop of , not a style property.

Because the library doesn’t expose allowFontScaling, axis labels always follow the device’s font scale, which can be 1.3–1.5+ on many devices and break layout.

Expected behavior

Provide a way to pass allowFontScaling={false} (or true) to the Text elements used for X & Y axis labels (and ideally tick labels / value labels / legend, if applicable).

Default can remain true to keep backward compatibility.

Proposed API (either option works)

Option A — Simple booleans

<BarChart
// …
xAxisAllowFontScaling={false}
yAxisAllowFontScaling={false}
/>

Option B — Pass-through props for axis texts

<LineChart
// …
xAxisLabelProps={{ allowFontScaling: false }}
yAxisLabelProps={{ allowFontScaling: false }}
// (optional) if you have separate tick labels:
tickLabelProps={{ allowFontScaling: false }}
/>

Internally, the chart would forward these props

to the underlying components that render axis/tick labels.

Why this matters

Accessibility and UX: some apps need to keep chart layout stable even when system font size is large, and provide alternate affordances (tooltips/zoom) without the axes breaking.

This is a small, non-breaking enhancement that enables developers to respect their product’s layout constraints while still supporting large text elsewhere.

[Abhinandan-Kushwaha]

Hi @Herik2201 Thanks for the suggestion.
I have added the prop allowFontScaling to Bar, Stacked Bar and Line charts to toggle fontScaling for X and Y-axis label texts. The default value is true.
It is available from versions 1.4.65 onwards. 🎉