While it’s possible to filter Salesforce Classic and Lightning reports and dashboards by values in Text Area (Long) format fields, there are some restrictions to keep in mind.
Filters applied to standard Text Area (Long) fields only permit the first 1000 characters to be searched.
Filters applied to custom Text Area (Long) fields only permit the first 255 characters to be searched.
If the filtered value doesn’t appear within the characters identified above, the filter returns false.
See also
Notes about Filtering on Types of Fields and Values
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