try adding some data to the model first and see if you can connect it to the raster calculator (can't test right now, but it would make sense)
Unfortunately did not work. I loaded in the data first then added the tool and connected it. Still can't double-click or right click open.
I can't tell from the image but is the spatial analyst extension licensed and available
Use extensions—ArcGIS Pro | Documentation
or is the tool locked?
I am still able to use the tool within Geoprocessing Pane, I just can't edit it within the model.