Greetings from synfusion support,
We are investigating your query regarding your request for remove the white spaces and shortened text while rotating the grid column Header. By default, grid will render the column header text horizontally and perform the clipping accordingly. We have just rotated the column header text using the custom CSS only for the visual purposes. But the other actions like text wrapping and clipping will be performed based on the horizontal width of the column header. Hence it is not possible to remove the additional white space in the column header.
Please get back to us, if you need further assistance.
Regards,
Sivaranjani Rajasekaran
Software Engineer.