UIFlexMode value which defines how the parent GuiObject grows or shrinks with available space in the flex layout container.

When the container's size is larger than the flex line's combined basis size, a value of UIFlexMode.Grow sets an effective 1:0 grow‑shrink ratio on the parent GuiObject. Objects set to UIFlexMode.Grow never shrink below their basis size, so overflow may occur if the container becomes smaller than the line's combined basis size.

When the container's size is smaller than the flex line's combined basis size and the controlling UIListLayout is not set to wrap (resulting in overflow), a value of UIFlexMode.Shrink sets an effective 0:1 grow‑shrink ratio on the parent GuiObject. Objects set to UIFlexMode.Shrink never grow above their basis size, so underflow may occur if the container becomes larger than the line's combined basis size.

When the container's size is either larger or smaller than the flex line's combined basis size, a value of UIFlexMode.Fill sets an effective 1:1 grow‑shrink ratio on the parent GuiObject. This setting ensures the flex line always fills the container, even if the container size changes.

For fine-tuned layouts, a value of UIFlexMode.Custom enables the GrowRatio and ShrinkRatio properties, allowing for relative growth or shrinking of the object in a ratio compared to other flex objects also under control of a UIFlexItem.

If there is free space in the flex line, this property determines the amount the parent GuiObject grows relative to other flex items in the line. Applies only if FlexMode is set to UIFlexMode.Custom.

Cross-axis alignment of the specific parent GuiObject within the flex line. See UIListLayout.ItemLineAlignment for details.

If there is overflow in the flex line, this property determines the amount the parent GuiObject shrinks relative to other flex items in the line. Applies only if FlexMode is set to UIFlexMode.Custom.