1e41f4b71Sopenharmony_ci# ArkUI Subsystem Changelog 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci## cl.arkui.1 Change in Check Rules on the \<Scroll> Component 4e41f4b71Sopenharmony_ci 5e41f4b71Sopenharmony_ci**Access Level** 6e41f4b71Sopenharmony_ci 7e41f4b71Sopenharmony_ciPublic 8e41f4b71Sopenharmony_ci 9e41f4b71Sopenharmony_ci**Reason for Change** 10e41f4b71Sopenharmony_ci 11e41f4b71Sopenharmony_ciThe [\<Scroll>](../../../application-dev/reference/arkui-ts/ts-container-scroll.md) component supports a single child component. To prevent multiple child components from being added, a check rule is added to the compiler to warn of such attempts. 12e41f4b71Sopenharmony_ci 13e41f4b71Sopenharmony_ci**Change Impact** 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_ciThis change is a non-compatible change. The new check rule does not affect the layout or behavior of the **\<Scroll>** component. 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ci**API Level** 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ci11 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ci**Change Since** 22e41f4b71Sopenharmony_ci 23e41f4b71Sopenharmony_ciOpenHarmony SDK 4.1.3.5 24e41f4b71Sopenharmony_ci 25e41f4b71Sopenharmony_ci**Key API/Component Changes** 26e41f4b71Sopenharmony_ci 27e41f4b71Sopenharmony_ci**\<Scroll>** component 28e41f4b71Sopenharmony_ci 29e41f4b71Sopenharmony_ci**Adaptation Guide** 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ciMake sure the **\<Scroll>** component contains only one child component. 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci## cl.arkui.2 Determination of the Cross Axis Size and stretch Alignment Mode in the \<Flex> Component 34e41f4b71Sopenharmony_ci 35e41f4b71Sopenharmony_ci**Access Level** 36e41f4b71Sopenharmony_ci 37e41f4b71Sopenharmony_ciPublic 38e41f4b71Sopenharmony_ci 39e41f4b71Sopenharmony_ci**Reason for Change** 40e41f4b71Sopenharmony_ci 41e41f4b71Sopenharmony_ciIn the **\<Flex>** container, the priority of the child component size is higher than that of the **stretch** alignment mode along the cross axis. If both are set, only the cross axis size of the child component takes effect. 42e41f4b71Sopenharmony_ci 43e41f4b71Sopenharmony_ci**Change Impact** 44e41f4b71Sopenharmony_ci 45e41f4b71Sopenharmony_ciThis change is a compatible change. 46e41f4b71Sopenharmony_ci 47e41f4b71Sopenharmony_ciAPI version 9 and earlier versions: If both the child component size and the **stretch** alignment mode are set for the cross axis, the cross axis size of the child component does not take effect. 48e41f4b71Sopenharmony_ci 49e41f4b71Sopenharmony_ciAPI version 10 and later: If both the child component size and the **stretch** alignment mode are set for the cross axis, the **stretch** alignment mode does not take effect. 50e41f4b71Sopenharmony_ci 51e41f4b71Sopenharmony_ci**Change Since** 52e41f4b71Sopenharmony_ci 53e41f4b71Sopenharmony_ciOpenHarmony SDK 4.1.3.5 54e41f4b71Sopenharmony_ci 55e41f4b71Sopenharmony_ci**Key API/Component Changes** 56e41f4b71Sopenharmony_ci 57e41f4b71Sopenharmony_ci**\<Flex>** component 58e41f4b71Sopenharmony_ci 59e41f4b71Sopenharmony_ci**Adaptation Guide** 60e41f4b71Sopenharmony_ci 61e41f4b71Sopenharmony_ciTo make the **stretch** alignment mode for the cross axis take effect, remove the cross axis size settings of the child component. 62