To reproduce:

1.Open the Demo application >> VirtualGrid >> First Look example and resize a column.

2.Then, move the form to a monitor with higher than 100% DPI scale factor.

Expected: the columns' width settings should be preserved.

Actual: the columns' width settings got reset.

In this case, we have GridViewTextBoxColumn and GridViewComboBoxColumn after it. We want to trigger the edit on the second column at the moment it is navigated with the key arrow navigation. To do that BeginEdit() method is called. However, manually calling this method will trigger key events on the editor inside the GridViewComboBoxColumn which will bubble to the parent and move the current cell to the next column (skipped the GridViewComboBoxColumn )

This behavior could be workaround by delaying the execution of the BeginEdit() method.

public class CustomGridBehavior : BaseGridBehavior
{
    Timer timer = new Timer();        
    public override bool ProcessKey(KeyEventArgs keys)
    {
        var result = base.ProcessKey(keys);
        if((keys.KeyCode == Keys.Left || keys.KeyCode == Keys.Right) && this.GridControl.CurrentColumn is GridViewComboBoxColumn)
        {
            timer.Interval = 100;
            timer.Tick += Timer_Tick;
            timer.Start();                
        }
        return true;
    }

    private void Timer_Tick(object sender, EventArgs e)
    {
        timer.Stop();
        this.GridControl.BeginEdit();
    }
}

this.radGridView1.GridBehavior = new CustomGridBehavior();

Code snippet for reproducing the error: 

            DataTable dt = new DataTable();
            dt.Columns.Add("Id", typeof(int));
            dt.Columns.Add("Title", typeof(string));
            dt.Columns.Add("Price", typeof(decimal));

            for (int i = 0; i < 10; i++)
            {
                dt.Rows.Add(i, "Row" + i, 0);
            }

            this.radGridView1.DataSource = dt;
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

            GridViewSummaryItem summaryItem = new GridViewSummaryItem();
            summaryItem.Name = "Price";
            summaryItem.Aggregate = GridAggregateFunction.StDev;
            GridViewSummaryRowItem summaryRowItem = new GridViewSummaryRowItem();
            summaryRowItem.Add(summaryItem); 
            this.radGridView1.SummaryRowsBottom.Add(summaryRowItem);

1. Group by some column or create hierarchy.
2. Select all from the parent header check box or in the header.
3. Expand parent row
4. As a result, the row expands, but selection disappears.

Call stack:

Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridGroupHeaderRowElement.Initialize(Telerik.WinControls.UI.GridViewRowInfo rowInfo) Line 100
	at Telerik.WinControls.UI\GridGroupHeaderRowElement.cs(100)
Telerik.WinControls.GridView.dll!Telerik.WinControls.Export.GridExportUtils.GetRowHeight(Telerik.WinControls.UI.RadGridView radGridView, Telerik.WinControls.UI.RowElementProvider rowProvider, Telerik.WinControls.UI.CellElementProvider cellProvider, Telerik.WinControls.UI.GridViewRowInfo gridViewRowInfo, bool exportVisualSettings) Line 158
	at Telerik.WinControls.Export\GridExportUtils.cs(158)
Telerik.WinControls.GridView.dll!Telerik.WinControls.Export.GridViewSpreadExport.AddRow(Telerik.WinControls.UI.GridViewRowInfo gridViewRowInfo, int rowIndex) Line 960

ConditionalFormatting dialog elements are overlapping in the Windows 11 theme. The text is clipped on the right:

The following line gets serialized when set this property:

((Telerik.WinControls.UI.GridSelectCheckBoxElement)(this.radGridView1.GetChildAt(0).GetChildAt(0).GetChildAt(2).GetChildAt(0).GetChildAt(0).GetChildAt(1).GetChildAt(0).GetChildAt(1).GetChildAt(0))).Visibility = Telerik.WinControls.ElementVisibility.Collapsed;