Candidate amount & layout cannot be customized

[kuanyui]

Tested under fcitx 5.0.10

• In fcitx5 chewing, candidate amount is limited within only 5 (too less!), and the layout is horizontal which is a little hard to read.

• In contrast, fcitx5 mozc has 9 candidates in candidate popup, and layout is vertical by default.

• And both chewing & mozc in fcitx5 seems not support customizing candidate amount nor layout.

[wengxt]

It's actually possible, but not in a good place and has some issue. (global config & classicui)

[kuanyui]

It's true... Thanks a lot!