The convention Saturday was held under the slogan "Poland Heart of Europe."
It comes after local elections this fall gave the party, Law and Justice, a severe battering in cities, though the party did well in rural areas.
Poles are enthusiastic about the European Union, with support around 80 percent in most polls.
Commentators concluded Saturday that the new approach reflects the party coming to terms with the fact that it won't prevail with a euroskeptic platform in elections next year to the European Parliament and national parliament.
Prime Minister Mateusz Morawiecki said "we are the beating heart of Europe" and that "today we inspire Europe."
Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.