Thank you for your detailed and well-documented post. Your observation is completely correct and highlights an important inconsistency.
As of September 2025, this is the current, known behavior of the modern list control while it is in preview for Power Pages sites using the Enhanced Data Model. The "Create" action is hard-coded to open in a new browser tab, whereas the "Edit" and "Details" actions open in the same tab.
Why This is Happening and What You Can Do
1. It's a Preview Feature Characteristic
You are right to point out that this is a preview feature. This type of inconsistent behavior is common for controls that are not yet Generally Available (GA). The functionality is determined by the product team, and unfortunately, there is no setting or configuration option available to you as a developer to change this behavior and force the "Create" page to open in the same tab.
2. Lack of a Supported Workaround
Because this is a managed control, there is no supported way to override the behavior with custom code. While it might be theoretically possible to write custom JavaScript to intercept the click and change the link's target, this is strongly discouraged. Such a script would be complex, unreliable, and almost certain to break during future updates to the Power Pages platform.
3. The Correct Action: Report it as a Feature Request/Bug
Your analysis is spot-on: this should be reported to Microsoft so it can be addressed before the feature becomes generally available. The most effective way to do this is by posting it on the official feedback portal.
- Action: Submit this issue as an "Idea" on the official Power Platform Ideas forum.
- Why this is the best channel: This forum is monitored directly by the Microsoft product group. Submitting your feedback there allows other community members to vote on it, which increases its visibility and priority for the engineering team as they work on finalizing the modern controls.
- Link to the portal: You can post your feedback here: https://ideas.powerplatform.com/ (Be sure to select Power Pages as the category).
Your feedback is valuable in helping to shape and stabilize these new features. By reporting it through the proper channel, you are contributing to the improvement of the platform for all users.
Best Regards,
Jerald Felix