Cannot type Chinese using fcitx5 under KDE

As a new or infrequent forum user, you are encouraged to take some time to familiarise yourself with Forum requirements; in particular, the many ways to use the forum to your benefit:

The Update Announcements contain a Known Issues and Solutions section and should generally be checked before posting a request for support.

Output of the inxi command (with appropriate parameters, and formatted according to forum guidelines) will generate information useful for those wishing to help:

inxi --filter --verbosity=8

or the short form (preferred):

inxi -zv8

Regards.