The TelerikTooltip component does not currently provide a way to select the Fit/Flip collision settings for the underlying common popup component (horizontal is Fit and vertical is Flip, always). Additionally, there is no support for horizontal flipping of the tooltip popup in the underlying JSInterop code for the TelerikTooltip, only vertical flipping. Please consider adding the ability to set both the horizontal and vertical collision settings (Fit/Flip) on the TelerikTooltip component via parameters and supporting horizontal flipping. See the TelerikPopup component for reference on the parameters.