Please refer to the attached sample project and follow the steps illustrated in the provided gif file.
Workaround:
public RadForm1()
{
InitializeComponent();
this.radPageView1.SelectedPageChanged += radPageView1_SelectedPageChanged;
}
private void radPageView1_SelectedPageChanged(object sender, EventArgs e)
{
if (this.radPageView1.SelectedPage != this.radPageViewPage1)
{
SelectionMiniToolBar selectionMiniToolBar = this.radRichTextEditor1.RichTextBoxElement.SelectionMiniToolBar as SelectionMiniToolBar;
if (selectionMiniToolBar != null)
{
selectionMiniToolBar.Hide();
}
}
}