Time: Any time
Frequency: Always
World name: Durandal
Character name: Dart Erhardt
NPC name: N/A
Monster name: N/A
Class/Level: 50 all jobs/classes
Party or solo: Party and solo
In-game time: Any time
Area and coordinates: Everywhere
Steps:
1. Use high resolution (I play at 1440p)
2. Hit enter in game and note small size of chat text input

The Font size in character configuration > Log Details only affects the size of the font displayed in the chat and not when inputting text. This makes it harder to see what you may be typing.