Try these checks first:
- Open Microsoft Photos and double-click a single photo so it opens by itself.
- Select Edit and look for Edit with Designer.
- Make sure the device is connected to the internet.
- Make sure the app is signed in with a personal Microsoft account.
If Designer still does not appear or open, repair the component it depends on:
- Go to Settings > Apps > Installed apps.
- Search for Microsoft Edge WebView2 Runtime.
- Select Modify > Repair.
- Restart the PC.
If it still does not work:
- In Settings > Apps > Installed apps, uninstall Microsoft Edge WebView2 Runtime.
- Reinstall the WebView2 Evergreen Standalone Installer.
- Run the installer as administrator.
- Restart the PC and try Edit with Designer again.
If the goal is to keep editing photos immediately, Microsoft Designer is also available on the web with a Microsoft account.