Sorry, I did not understand what you are doing
Please elaborate
Use Do it to debug your blocks
If you want to find the index of an item in a list, then you should look for that specific item instead of a complete list
Use the companion app and Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.