Change the Default Selected Filter Operator:
https://docs.telerik.com/devtools/wpf/controls/radgridview/filtering/how-to/howto-change-the-default-selected-filter-operator

This doesn't work for boolean columns, if the property "ShouldGenerateFieldFilterEditors" of the column is set to "True". 

Please see the attached example.

*** The fix for this issue will be available with the next LIB (version 2018.3.1217) expected on Monday, December 17.

radGridView has a feature to provides a suggest and append feature.  Currently, there is the ability for the end user to inadvertently close this window.  Please provide the opportunity via a property to disable the ability to close the search window.  (currently, I am hooking the SearchPanelVisibilityChanged event, and forcing showSearchPanel = true at all times.

Scheduled for: 
The exposed property (SearchPanelCloseButtonVisibility) will be available with LIB (version 2018.3.1210) published on Monday, 10-th December, 2018. 

The fix for this issue will be available with the next LIB (version 2018.3.1203) expected on Monday, December 3.

Using such negative margin leads to some parts of the template to be actually outside of the control boundaries.

The fix for this issue will be available with the next LIB (version 2018.3.1203) expected on Monday, December 3.

The fix for this issue is available with LIB (version 2018.3.1126) published on Monday, November 26.

A workaround for the issue is to apply a 1px top Margin.

The fix for this issue is available with LIB (version 2018.3.1126) published on Monday, 26th November, 2018.

The fix for this issue will be available with the next LIB (version 2018.3.1126) expected on Monday, November 26.

Allow customizing the FieldFilterControl shown under the column header when the FilteringMode is set to FilterRow. Currently, you can customize this only via an implicit style or by looking into the gridview's visual tree in code. It would be useful if you can define a style per column.

A possible workaround is to show and hide the columns.

foreach (GridViewColumn col in TestGridView.Columns)
			{
				bool visibility = col.IsVisible;
				col.IsVisible = true;
				col.IsVisible = visibility;
			}

ArgumentOutOfRangeException is thrown when performing a CollectionChange with Replace action on the underlying collection and there's an applied FilterDescriptor.

The vertical scrollbar measure incorrectly when the control's ItemsSource is populated in its Loaded event. To reproduce this, set the ItemsSource when the control is initialized. And then populate it on Loaded. Also, to reproduce this you will need to define the columns manually.

To resolve this, populate the data on initialization of the gridview. Or delay the population to happen after the Loaded event. You can use a dispatcher for this.