Variables can be created from different areas or panels in the UiPath Studio interface, such as the body of an activity, the properties panel, the expression editor, or the variables panel. However, the activities panel is the only one among the given options that is a valid area for creating variables. The activities panel contains a list of activities that can be dragged and dropped to the designer panel to build workflows. By right-clicking a field in an activity and selecting Create Variable from the context menu, or pressing Ctrl+K, a variable can be created and assigned to that field. The variable's type and scope are automatically determined based on the activity and the container it is part of.
References:
* Create Variables Tutorial in Studio | UiPath
* Studio - Managing Variables - UiPath Documentation Portal
* Managing Variables - UiPath Studio