SPFx Regression: Can't Add Single-Part App Pages via UI in Updated Template Gallery

[baldersjake]

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

None

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

SharePoint Online

Describe the bug / error

The new SharePoint Template Gallery no longer allows users to create single-part app pages via the SharePoint UI. This feature was essential for quickly integrating SPFx full-width web parts into modern SharePoint pages.

Previously, it was possible to create a single-part app page with just a few clicks, without manually editing the page layout. This capability has now been removed, creating a frustrating and less efficient experience for both developers and end users.

Reference to how it worked before: https://pnp.github.io/blog/post/spfx-10-single-part-app-pages/

Steps to reproduce

1.Go to a modern SharePoint site.
2.Click New > Page from the site.
3.In the new Template Gallery, notice that there is no option to create a single-part app page.

Expected behavior

Users should have the ability to quickly create single-part app pages directly from the SharePoint page creation UI, as previously supported. This allows seamless integration of SPFx applications using full-width web parts without requiring manual page modifications or using Powershell.