If I understand correctly, there isn't a button in the Attribute Table in ArcGIS Pro for Selecting All Records.
We can select all records by hitting the Switch Selection button, when no records are selected, which will select all records. But that's not very user-friendly; it took me a while to figure out how to do that.
I think it would be better if there were a straightforward Select All Records button or menu option. Similar to what we have in ArcMap: https://desktop.arcgis.com/en/arcmap/latest/manage-data/tables/selecting-all-records-in-a-table.htm
Thanks.
ArcGIS Pro 3.0.2