Hi Carles Steve,
Thank you for reaching out to us. Could you please provide more details about the exact scenario you need to achieve with the SfTextBoxExt SuggestionBox? Specifically, do you need to customize the width of the SuggestionBox, or is there something else you're looking to adjust? This information will help us better understand your requirements and provide an effective solution.
Please don't hesitate to contact us if you have any further queries or concerns.
Regards,
Hariharan.