If your account is connected with multiple companies and you want to switch to another. Click on the company drop-down box on the top right corner, select the company you would like to enter, and you will be redirected to another company's page in three seconds.

Tips:
By default, companies are listed in reverse order of creation time, and the first company added or created is shown at the bottom.
For those companies whose status is not active, they are not displayed at the multi-company drop-down box.
If you sign out, the company you enter next time is the same company you entered in the last sign-in.