How do you show that a feature can be selected individually or combined with another feature?

1. How do I display only selected features in ArcGIS?
2. How do I select multiple features in ArcGIS Pro?

How do I display only selected features in ArcGIS?

Right-click the layer in the table of contents, point to Selection, then click Open Table Showing Selected Features.

How do I select multiple features in ArcGIS Pro?

For selecting multiple features at once, hold the shift button and select more features. At the bottom of the map view, the Selected Features counter will be set to one.