Language, theme, and timezone
How you set your own working preferences, and why your language and your client's are separate.
Language
Choose English or French for your own interface. It changes immediately.
This is yours alone. Each client is contacted in their own language, whichever you work in, so an English-speaking accountant can serve a French-speaking client and both read everything in their own language.
Theme
Light or dark for the app, or follow your computer's setting. Your clients get their own light and dark switch on their portal.
Timezone
Set your timezone so dates and times read correctly, and so reminders land at a sensible hour rather than in the middle of the night.