A Geographic Coordinate system with a WGS_1984 datum is still in decimal degrees.
Perhaps, you need some background material
Coordinate systems, projections, and transformations—ArcGIS Pro | Documentation
Common projected coordinate systems include, UTM, Albers, State Plane (in US)... there are thousands, so pick one commonly used for your area and areal extent
Also, always add the result you get from the projection to a new empty map with no basemap added, because of projection-on-the-fly issues
... sort of retired...