I am afraid that RadGridView can only allow one filter editor (it is a RadDateTimePicker hence one value) in the "Filter Row" mode by design. We don't support the Between operator as well so there is no way to do this in the filter row mode where you can only have a single editor.
Unfortunately, the Popup mode is the only mode that allows date range filtering since it contains two field filter editors, i.e. two RadDateTimePicker's.
The only way to achieve something similar would be to turn off all built-in filtering and then implement manual filtering. The manual filtering can be achieved by editing the control template of the GridViewHeaderCell and placing the needed UI controls there, I suppose they can be two RadDateTimePickers. From the values chosen in those date picker you can then perform programmatic filtering of the grid as described here. It is like filtering the grid programmatically through an external UI only that this external UI will be stuck inside the GridViewHeaderCell control template. I am not sure how beautiful this will look like. Unfortunately, we do not have an example or a sample project for such a custom requirement.
The default filter operator can be changed as described here.
The button can be hidden by editing the control template of the FieldFilterEditorControl with Expression Blend. More about styling and templates can be found here.
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