UWP print support app default window size

Hi @Ambigavathi Dhanapal .

From the screenshot, it looks like the page content is wider than the window that is hosting the print preferences UI. For a UWP Print Support App/settings UI, the outer preferences window is generally hosted by Windows, so the app may not have the same control over the window size or title bar as it would in a normal standalone UWP window.

I would first check the XAML layout of the preferences page:

• Avoid fixed Width, MinWidth, or large fixed margins on the root Grid, panels, or columns.
• Use Grid star sizing (*) / Auto columns instead of hardcoded pixel widths.
• Put the main content inside a ScrollViewer if the content can exceed the available window size.
• Use VisualStateManager / AdaptiveTrigger to change the layout when the available width is smaller, for example moving the print preview section below the settings section or hiding/collapsing it.
• Check whether the issue changes with Windows display scaling / DPI settings.

For example, the page could be structured more like this:

<ScrollViewer
    HorizontalScrollBarVisibility="Auto"
    VerticalScrollBarVisibility="Auto">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>

        <!-- Left menu -->
        <!-- Main settings content -->
        <!-- Print preview panel -->
    </Grid>
</ScrollViewer>

For the title bar, if this is the Windows-hosted print preferences/settings window, it may not be removable from the app side. UWP title bar customization APIs apply to the app’s own window, but they may not affect the shell/window frame used by the print preferences host.

Could you please share the XAML of the preferences page and the code where you handle the Print Support Settings UI activation / navigation? That would make it easier to confirm whether this is caused by fixed layout sizing in the page or by the host window behavior. If you found my response helpful or informative, I would greatly appreciate it if you could follow this guidance or provide feedback.

Thank you.