OS: MacOS 10.14.5
Minecraft Version: 1.14.4
Antique Atlas Version: 5.1.3 for Fabric

I enabled the overlay for the atlas within the config however once I held it the overlay was blank. I can open the atlas and everything shows up normally but the overlay is currently non-functional.

This is the same for me with--
MacOS 10.14.6
MC 1.14.4
Fabric 0.6.3-b168
Fabric API 0.4.1-b245
Cotton 1.0.0-rc3

Fixed in 5.1.4-fabric.