Hi Eugenio,
Greetings from Syncfusion Support.
By default the width of the cells will be reduced based on the number of resources adding but when the cell width reaches it minimum value (i.e., 36px) then the horizontal scroller will set to the scheduler irrespective of the views(Day, Week, WorkWeek) and for the same we have prepared a sample, which can be viewed from the following link,
Kindly try the above sample, if you have any concerns please revert us back for further assistance.
Regards,
Hareesh