Hi chetanmdm, if you change an existing policy with the Required password type and Minimum password length settings that already configured, then Android Enterprise 12+ devices will automatically use the Password complexity setting with the High complexity which will block Patterns.
For Android Enterprise 12+ devices, it's recommended to create a new policy and configure the Password complexity setting to take advantage of the available options. When configured to None, Intune doesn't change or update this setting, and by default, the OS may not require a password/allow pattern/PIN. More info can be found here to configure the settings to your preference: https://learn.microsoft.com/mem/intune/configuration/device-restrictions-android-enterprise-personal#android-12-and-later. Hope this helps!