What about the fix added in 4.01?
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Display Settings

The option "Enlarge system UI" has been added under "User Interface Size."
This setting is only available when User Interface Size is set to 100%.
Enabling this setting will allow players to restore the size of UI elements such as the main menu and chat log window to that of patch 3.57.
Restoring UI elements to patch 3.57 sizes.

1. Under User Interface Size select 100% and check the box Enlarge System UI.
2. Under Default UI Size set Default Size to 140% and apply changes to all UI components.


https://na.finalfantasyxiv.com/lodes...691b3fadfb35e5
It's posted with pictures here in the patch notes, but it's a quirk with the resolution changes that came with Stormblood.