How do I set roundness for buttons?

[joshua-revolutions]

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I'm using the FAB button. I'm using v5 of react-native-paper. Even if I set roundness to 0 in the custom theme nothing happens:

const customTheme = {
    ...DefaultTheme,
    dark: false,
    roundness: 0,
    colors: {
        primary: colors.primary,
        accent: colors.primary,
        background: 'white',
        surface: white,
        error: '#B00020',
        text: black,
        onSurface: '#000000',
        disabled: color(black).alpha(0.26).rgb().string(),
        placeholder: color(black).alpha(0.54).rgb().string(),
        backdrop: color(black).alpha(0.5).rgb().string(),
        notification: pinkA400,
    },
    //@ts-ignore
    fonts: configureFonts({ config: fontConfig, isV3: true }),
    animation: {
        scale: 1.0,
    },
};