Location of code for "Theme Settings" List? Dawn

[Brian-A]

What is the location for the code of the "Theme Settings List"? 

Someone added special code on another project of mine, but I forgot to back up. I managed to find some of the code he used and import it to my current theme. I can't just find the code he used to add the tab. 

Any partner want to connect to my store and check?

Or any suggestions what I should look for? I tried to look for custom file names under theme.liquid to see if he included anything, don't think I found anything that pops out

[Hamza_Hussain]

There is a file called settings_schema.json it contains all the schema settings. you can find the file by searching as in the image.

If you need any help you I'll be more than happy.