Back to original settings

I am new to this forum and will start using BTT very soon. I already saw some video's and read some posts about nice presets.

The question i have now is, where is the original file located if my first script does not work and the touchbar is complete messed up? and is this only ONE file you simply can replace so the touchbar is back to the standard one?

Please give me some basic explanation about this matter. Thanks.

You can see all presets that are loaded by clicking the presets button on the top right:

What action must i choose to start a program. I have a button called Sonos, and now i need to open the program.

"Launch Application / Open File / ...."

Found it and works. Now the icon from the sonos app and the button must stay.