Thai Font in ArcGIS

 https://datarevol.com/gis/arcgis-encoding/

https://desktop.arcgis.com/en/arcmap/latest/map/styles-and-symbols/understanding-text-font-size.htm

Vertical Font

https://desktop.arcgis.com/en/arcmap/latest/map/working-with-text/vertical-placement-for-asian-text.htm

แก้วรรณยุกต์ลอย จม ขาด Illustrator Photoshop

https://grappik.com/how-to-fix-thai-intonation-marks