You can quickly access your list of companies by clicking the the arrow next to your company name 

There you have 3 options: 

1- Use the search bar to type the company you are looking for.

2- Scroll down and select the company you want to open.

3- Open the Company List menu. (Found in the RED square, seen in the picture above)

The Company List menu has two sections:

  1. My companies: this is the list of your companies, i.e. companies that have been created from your user account.
  2. Companies shared with me: this is the list of companies that have been shared with you by other users.

To work in the budget of a company, simply click on the name of the company and choose the budget in which you want to work.

Note that by default, all users have a DEMO company shared in their account. DEMO gives you access to a model read-only company to visualize how to use the different sections of the budget tool.

Related Articles (Please refer to the links below)

-How to share a company?

-What are the different sharing permissions? 

-How to change sharing permission?

-How to ADD A NEW COMPANY in my account?