Once you run Wazaterm as an app with PWA, ctrl-space to change IME(English to Japanese, for example) doesn't work. Looks like ctrl-space was taken by the OS(or the browser), and unable to switch your language inputs. However, you can use ctrl-shift-space to switch them. I may take a while to get used to it but I'm sure that you use English most of the time and sometimes swtich to your lang. so it should be suffient.