Hi @AaronArias,
If you want to just display unique Id_Cita with corresponding records, I think you could try the GroupBy() function, which will help you group by the Id_Cita column and have a nested table including all the records sharing the same Id_Cita .
GroupBy(List,"Id_Cita","GroupId")
However, the DataTable is different from the Gallery on grouped records displaying.
The GroupBy() make your original data source changes like below:
| Id_Cita |
GroupId |
| 1298 |
[Table] |
| 9259 |
[Table] |
And the nested table expands with all the other column values, so if you want to display other column values, you should use AddColumns() to create a temporary column to display.

You could not use the Concat() function on the original field to show the grouped field values because all the other column values are shaped into the GroupId group.
To display other column values, you could set the Items property as below:
AddColumns(GroupBy(List,"Id_Cita","GroupId"),"TitleNew",Concat(Filter(GroupId,Id_Cita=Id_Cita).Title,Title,","))
