Google Contacts preview searches everywhere when you search your contacts. I find it makes it very difficult to search my own contacts because of the feature. Is there a way to disable it?
Doesn't look like it, no. I'd have expected some sort of search operator (
in:my-contacts perhaps?) but it doesn't look like they have any. It is a preview, after all.
Your recourse is probably to go back to the existing contacts manager.
I'd suggest, at least, using the "Send feedback" tool to let Google know that you would like to see changes to the search.