Is it possible to hide Visual Studio errors related to XAML that are not currently relevant and enable them when needed?

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Yes, it is possible to hide Visual Studio errors related to XAML that are not currently relevant and enable them when needed using the Error List window.

To do this, follow these steps:

1. Open Visual Studio and your XAML file.
2. Click on the Error List window to open it.
3. In the Error List window, click on the filter button (the funnel icon) and select "Errors and Warnings".
4. Click on the triangle next to "Errors and Warnings" and select "Suppress Issues" from the dropdown list.
5. In the Suppress Issues window, select the error(s) you want to hide and click on the "Add" button.
6. Click on the "OK" button to close the window.

Now, the selected errors will be hidden from the Error List window. To enable them again, simply go back to the Error List window and click on the "Show Issues" button, then select "Suppressed Issues" from the dropdown list. This will show you the list of suppressed errors, and you can select the ones you want to enable and click on the "Remove" button.