Hi Tashayla,
Can you tell me what the type of this field(Payment Note) is?

In general, if your calculation only uses simple text or number values from the same entity it should be sortable.
Otherwise, Calculated Field become unsortable in views if:
?A calculated field that contains a field of a parent record.
?A calculated field that contains a logical field (for example, address field).
?A calculated field that contains another calculated field.
Regards,
Leah Ju
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