This title (that can be translated) is only interesting if the field is a criterion.
It is initialized by default with the title of the criterion field as it is defined in the dictionary, but it can be modified (it will then become a "specific text" if it is personalized).
When these criteria concerning the same title are displayed on several data models, a grouping is carried out in the right part (the count of the number of lines found by criterion value is totaled for all the documents - i.e.. data models - where the search is carried out).
Note: by "same title" is implied the same number of translatable text (in order to avoid a grouping when a same title describes different facts, as it is for the French word "Etat", which can either be a print, a geographical subdivision and the value of a property).