If you are added to multiple organisations (when your email you use to login is added to more than one organisation) you will have "Switch organisation" button available in more options. You can use it to switch and navigate between different organisations.
Click on your picture or initials in top right corner to see more options. Then select "Switch organisation" from dropdown menu. Dialog pop-up will be opened where you would click on organisation you want to enter and you would be immediately redirected to it.