It is fine in version 26 on Windows OS.
I see in your image you don't have the Archicad icon or the dialogue close/minimise buttons.
I am assuming you are on a Mac because of the round dialogue box corners.
Are you by any chance running the ARM Tech Preview for 26?
And remember, these list schemes are old technology from about 20 years ago and have not been updated in recent version for many years - replaced with Interactive Schedules.
So they don't work with new tools like stairs, railings and openings.
And I am not sure if they work with the new segmented beams and column tools.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10