search-nonincremental-instead

search-nonincremental-instead is a variable defined in `isearch.el'.
Its value is

t

Documentation:
If non-nil, do a nonincremental search instead of exiting immediately.
Actually, `isearch-edit-string' is called to let you enter the search
string, and RET terminates editing and does a nonincremental search.

You can customize this variable.