Different businesses have their own Documents (Invoices, Estimates/Quotes, Expenses), Business details, Payment options, Template settings, Client communication, tax settings, Client lists and Service & Product lists
MOBILE APP
In the main Home menu click on your business name
or
Select ⚙️Settings and select your businessA list with added business appears
Select a business and click Done

WEBSITE
Click on your business' name in the upper right corner
A list with your businesses appear
Select a business by clicking on it