Custom widget titles in the Widget builder are limited to 45 characters. Longer titles are also truncatestruncated, depending on the chosen widget style and size, to make sure that all elements of your widget look perfect when published.
It is recommend recommended that you keep custom titles short and concise, ensuring that the full title is visible within the widget. You can use the preview within the widget Widget builder to visualise how the title will be truncated depending on the style that you have selected.
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