In a selection of page elements, there is always one element marked as the primary selected item.You can recognize the primary selected item by its black grab handles with a white border, while other selected items have white grab handles with a black border.
When multiple text elements are selected and Element Properties is clicked (from the Elements menu), the Text Properties window will show the properties of the primary selected item.
If you adjust a property and click Apply, the change will be applied to all selected text elements.
If the elements on your page are locked, the grab handles’ background color will appear gray instead of black or white.
Still, the primary selected item will remain recognizable by its white border.