An additional option becomes visible in more options (your image/initials) drop down menu when a user account is added to multiple organizations - Switch organization. Once clicked a pop-up window opens presenting all organizations where this user account is added.
Note: This list won't contain organizations where a user is registered with a different email address (it's a separate entity, system wise).
Current organization won't be visible in the pop-up window but it will be shown underneath your name in the drop-down menu.
Clicking on chosen organization's logo in the pop-up window will instantly redirect you to it. Searching by a keyword to narrow down options is also available.