You have to edit the ControlTemplate of RadTileViewItem and hide
the MaximizeToggleButton by setting its Opacity to 0. I am saying hide because if you remove the MaximizeToggleButton, you will not be able to change the state of the tiles. More information on how to edit the ControlTemplate of our controls you can find here
. Also I am attaching my sample project for further reference.
All the best,
the Telerik team
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