You can confirm matching layers in your design using two methods.
1️⃣ With Design panel open, select an object in layer panel & hold down the shift key
Layers that match selected object will have light blue outline.
2️⃣ With Prototype panel open, hover over object on canvas with mouse
Children of top-level frame: Layers that match will have matching dark blue outline while hovering.
Nested elements: Hold down the control key while hovering. The bottom nested layer and any matching layers will be highlighted in blue.