Labels have been overhauled in ARCHICAD 19 so that pane has disappeared as it is no longer relevant in AC19 and later.
The below playlist details all the enhancements made to Labeling in ARCHICAD 19:
https://www.youtube.com/playlist?list=PLnXY6vLUwlWV4o6WaXSS4RR1ZW5CPeFgN
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AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995