The Dynamics Tailor Hi 👌🏼,
Yes, you can easily switch between accounts by press and hold the Profile icon. That simple.
To make things even easier, you can give Company A access to one or more accounts of Company B. This way selected account from Company B will also show up in your account view of Company A. That saves having to switch all the time, even for simple things as wanting to check your account balance.
Want to know more about it? Let me know