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Verified this issue with Visual Studio 17.11.0 Preview 1.1 (8.0.40&8.0.21). Can repro on iOS platform with sample project.

Issue 1: Since the parent grid is set to center alignment, the editor is aligned according to its size. If you want the editor to occupy the entire width, set the grid's horizontal options to "Fill" so the editor can take up the available space.

    <Grid
        RowDefinitions="Auto, *, Auto"
        ColumnDefinitions="130*, 100, 130*, 1"
        HorizontalOptions="Fill"
        Margin="0,0,4,5">

       ...
</Grid>

Issue 2: There doesn't appear to be any issue when changing device orientation at runtime. Could you please provide additional details, such as a screenshot or video, for better clarity on the issue?

HorizontalOptions="Center" to HorizontalOptions="Fill" makes no difference. The error remains. Tested on an iPad with iOS 17.7.
See images on the project repository.
It works correct on Android and Windows.

Yes @geertgeerits, I missed some code.
We need to set the horizontal option for the inner grid. The screenshot below shows the resulting output.

If we set the horizontal options for both grids, the output will look like this.

The first problem is solved with that but not the second. When you press the 'Click me' key in vertical position you see the full text. Turn the device to horizontal position and then back to vertical position then you notice that the text is not displayed completely. On the iPad the text is lost after OOOOOO-P. So the letters P, Q, R, S, T are not displayed.

@geertgeerits, The issue with horizontal scrolling has been resolved in the latest .NET 9 package. Could you please verify this with .NET 9?

Hi,
The error is still there: ScrollView: Orientation="Vertical": The orientation is wrong when the device is rotated from landscape to portrait. The orientation is changed to horizontal.
When entering a text (click the 'Click me' button) in portrait position, then turn the device to landscape position and then back to portrait position, you wil see that there is text missing. Link to public reproduction project repository:
https://github.com/geertgeerits/MauiBugEditor
See screenshots on the repository: IMG_5471-Portrait before.PNG - IMG_5472-Landscape.PNG - IMG_5473-Portrait after.PNG
I think it has to do with the HorizontalOptions property of the editor.

Visual Studio 2022 Preview: version 17.12.0 Preview 5.0
Microsoft.Maui.Controls: version 9.0.0-rc.2.24503.2
Microsoft.Maui.Controls.Compatibility: version 9.0.0-rc.2.24503.2