With this product-specific custom field you enter the desired title for the corresponding datasheet. It is displayed as the label of the datasheet on the product page.
Each of the three datasheets (Datasheet 1–3) has its own title field.
Custom field
You can find the "Datasheet 1 – Title" custom field in the respective product:
Tab "Specifications" ⇒ Block "Custom fields" ⇒ Tab (Set) "Datasheets (... Pro)"
Type: Text
Technical name: twt_{theme}_{edition}_custom_field__product__datasheet_1_title