Hi @Gonzalez, Susana ,
Welcome to Q&A forum!
You are right that the modern calendar view in SharePoint Online does not support the same overlays as the classic view. However, there are a few workarounds for your reference:
- Create multiple calendar views: You can create a separate calendar view for each set of dates (e.g., regression dates, pre-production dates, approval dates) and color-code them accordingly. While this does not merge them into a single view, it allows you to easily switch between different views.
- Custom SPFx Web Part: If you are familiar with development, you can create a custom SharePoint Framework (SPFx) Web Part to display a calendar with events from multiple lists. This approach provides the most flexibility but requires development skills.
- Third-party solutions: There may be a third-party tool that can meet your needs. Hope these can help.
Good day!
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.