Here are a few ways to rewrite the title, depending on the desired level of formality:
Option 1 (Most formal and academic):
Collaborative Development of Digital Tools to Mitigate Health Misinformation: A CIVIS Open Lab Workshop at NKUA
Option 2 (Direct and professional):
Advancing Digital Solutions for Health Misinformation: NKUA Hosts Successful CIVIS Open Lab Workshop
Option 3 (Concise and impact-focused):
Co-creating Strategies Against Health Misinformation: A CIVIS Open Lab Initiative at NKUA
Recommendation: Option 1 is the most appropriate for a formal report, press release, or academic publication.