I am working on Umbraco 12 headless. I want to update preview url so when content editor save and preview from Umbraco it goes to diferent domain. Help required to configure custom preview url

I believe this is currently not possible but a feature that will be part of the upcoming v12.3.0 https://github.com/umbraco/Umbraco-CMS/pull/14773

there is no way to customise in umbraco 12?

There will be in a week and a half, when umbraco 12.3.0 is out: https://our.umbraco.com/download/releases/1230 Feel free to try the release candidate if you need this functionality now.

@Sebastiaan doesn't Mads' PR only provide an option to specify additional preview URLs, but not anything for modifying the primary preview URL - which I guess is what you want in a headless setup

I guess you could probably intercept it, not sure. If you need it @Nilay please leave a message on that PR 14773 and I would recommend creating a new issue where you describe what you're trying to achieve!