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I think that you should add a way to customize the DelimiterChar in the preview of the SfInPlaceEditor when set to MultiSelect mode. I have specified the delimiter of the actual MultiSelect to ", ", but the preview is just using "," (without the space). I am thinking that you can either add it as a property named 'MultiSelectDelimiterChar' to the SfInPlaceEditor component, or you can create a new component named 'InPlaceEditorMultiSelectSettings' with a 'DelimiterChar' property. Even better, you can create a PreviewTemplate that allows you to accept the TValue as context and display whatever you'd like in the preview of the InPlaceEditor.