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Fix SharePoint Power Apps Form Opening in a Small Window

Adam Davis Sep 27, 2026 869 views

Question details

A SharePoint list customized with a Power Apps form opens in an abnormally small, centered window instead of its standard size.

How to Fix SharePoint Power Apps Form Opening in a Small Window

Product: Microsoft SharePoint / Power Apps
Device & OS: not provided
Scenario: Accessing or creating an item in a customized SharePoint list after a recent Microsoft Lists interface or integration update.
Observed behavior: The Power Apps form renders in a restricted, small window in the center of the screen, making it difficult to view and interact with the form fields.

Before you start

Verify if the issue persists across different web browsers, and check the Microsoft 365 Admin Center for any active service health advisories related to SharePoint or Power Apps.

Solution 1Recommended

Check Microsoft Service Updates and Contact Support

Since this is a known interface rendering issue linked to the new Microsoft Lists integration, checking official service updates and engaging support is the most effective approach.

This issue is primarily caused by recent backend changes to the Microsoft Lists interface and how it hosts integrated Power Apps forms. Because it is a rendering container issue on Microsoft's side, local configuration changes or disabling site-collection features often do not resolve it permanently.

Check Service Health

Navigate to the Microsoft 365 Admin Center, click on 'Health', and select 'Service health' to see if there are any ongoing advisories regarding SharePoint list forms or Power Apps integrations.

Identify Affected Lists

Check other SharePoint lists in your environment. Identify if the issue only affects lists using the newer Microsoft Lists interface, which confirms the issue is interface-related.

Open a Support Ticket

If no advisories are listed, navigate to 'Support' in the Microsoft 365 Admin Center and open a New Service Request. State clearly that the Power Apps form size changed due to the new SharePoint Lists interface without any manual form modifications.

Check Microsoft Service Updates and Contact Support

Solution 2

Re-publish the Customized Power Apps Form

Forcing an update and republishing the form can sometimes refresh its rendering properties and force SharePoint to reload the form container.

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Frequently Asked Questions

Why did my Power Apps form suddenly change its size in SharePoint?

The form size change is typically caused by Microsoft pushing updates to the SharePoint Lists interface. The new integration container can sometimes conflict with custom Power Apps form dimensions, forcing them to render in a small, centered window.

Will disabling the new Lists integration at the site level fix the form size?

In most reported cases, disabling the new Lists app integration at the site-collection level does not revert the Power Apps form to its original size. The root cause lies in the backend rendering of the SharePoint list interface.

Can I manually resize the form in Power Apps Studio to fix this?

You can attempt to adjust the form size and orientation within the Power Apps Studio settings by navigating to File > Settings > Display. However, if the issue is rooted in the SharePoint host interface, the web part container will still restrict the form's display size regardless of your custom settings.

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