Right-click on the block and select Help. The documentation page of that block will be opened. There you can see which libraries contain the selected blocks. For example for the Constant Power block:
You can see that it is a Constant block and can be found under five libraries in the library browser. If you are viewing the model in the documenetation window and need to open the model in the first place, type open_system('RFNoise') in the command window.
