Hi @AnttiKai ,
You can create a JavaScript WebResource with the following content (in my case is called diana_openDialog.js, but you can choose the name you want)
function hideTabs(executionContext){
var formContext = executionContext.getFormContext();
formContext.ui.headerSection.setTabNavigatorVisible(false)
}
and register it on the Form.OnLoad event.
Using the classic customizing, is tools like this:
When you register to "OnLoad" don't forget to set the "Pass execution context as first parameter".
Otherwise, if you are using the new maker portal, you need to add the WebResource first (Form, libraries) ,and then add the OnLoad handler pointing to the "hideTabs" function (on the right)
Then save, and publish, refresh the form... and you don't have any tabs on your form anymore.
