https://userapps.support.sap.com/sap/support/knowledge/en/3359083
3359083 - SAP Emarsys - Segmentation filter case sensitivity | SAP Knowledge Base Article
Segmentation filters on contact criteria text fields follow different design depending on the search option. "Image/data in this KBA is from SAP internal...
sap emarsysfilter caseknowledge basesegmentationsensitivity