Setting a default plan is one of those tiny bits of functionality that deal with the big annoyance of being asked repeatedly about something!
If both plans are left as ‘Set as default’ when ordering searches you will always be asked to select which plan, which we appreciate can become frustrating. But if you mark one as Default, then it will be associated automatically. No more asking.
Even better, if you already have searches in draft you will get the option below for even greater convenience.