https://docs.unity3d.com/ScriptReference/UIElements.BaseField_1.UpdateMixedValueContent.html
Unity - Scripting API: UIElements.BaseField_1.UpdateMixedValueContent
scripting apiunitybasefield
https://docs.unity3d.com/6000.3/Documentation/ScriptReference/UIElements.BaseField_1.UpdateMixedValueContent.html
Unity - Scripting API: UIElements.BaseField_1.UpdateMixedValueContent
scripting apiunitybasefield