If you are trying to view these just so you know they are being shows correctly, then you can enter debugging mode (very similar to debugging in a livescript) by clicking the '-' (on the left hand side of the code view) next to the line number directly after the line of code you are querying. This pauses the app code and all variables within the current function are displayed in the workspace.
If you are wanting to use these variables within Matlab (not App designer), then you can use the following at the top of the function within the app which contains what you want:
Then you simply go to your command window, type exactly what you put in the app and the variable should show up in the workspace.
Let me know of any problems and I'll try my best to help.