OX Calender WebUI does not show GATEGORIES field

[ulf.steiner]

Hello everybody,

in OX calender I can not see the CATEGORIES field.

I use Thunderbird to write CalDAV into OX. And the
OX WebUI does not show the CATEGORIES field.

What do I need to change, so that the OX calender UI
returns the CATEGORIES field?

Many thanks in advance for any hint....

Ulf Steiner