https://support.apple.com/en-mo/guide/chinese-input-method/cim11841/mac
When using a Chinese input source on your Mac, you can enter Latin characters as either half-width or full-width.
chinese input methodlatin charactersentermac
https://support.apple.com/en-afri/guide/chinese-input-method/cimkeyt36646/mac
When using a Traditional Chinese input source on your Mac, use keyboard shortcuts to change the input source, open settings, or convert text.
chinese input methodkeyboard shortcutstraditionalmac