Resolved! STM32CubeL4 Rev 1.14.0, B-L475E-IOT01_BSP_User_Manual.chm hasn't texts in each item.
After unzip a STM32CubeL4 Rev 1.14.0 file.I open B-L475E-IOT01_BSP_User_Manual.chm file. It hasn't texts in each item.But Rev 1.13.0 has texts in each item.I am not sure this file is incomplete in a ZIP file or not.