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.
I had a similar problem. After a few hours of trying, I found that if I made a bunch of raster calculator objects I could add parameters sometimes (open the raster object in the model) but it would never run properly. My peers who had a similar problem said that deleting ArcGIS and Downloading the latest software version resolved the problem.