Just enabled it, I noticed the setting a while ago but must have forgotten to enable it on my new computer. I’ll copy my existing saves around to the new folder if needed.
I didn’t find a “program” folder along the itch app to find butler, but I did find a butler.exe (along with 7z.dll etc.) in this path:
C:\Users(username)\AppData\Roaming\itch\broth\butler\versions\15.26.1
It’s still easier for me to user the one I installed via itch app in a custom folder since it wouldn’t feature the version number.