By default, the projects are in alphabetical order at the Projects section at the sidebar. But you could drag and drop to reorder Projects.
Note: This rearrangement will only be applicable for your personal view. Others in the same organizations/ projects won’t be able to see your new rearrangement.
Also, you could transfer a project from one organization to another by dragging and dropping.
For resetting the orders of your projects, click on the More Options icon beside each organization instead.
You can hide your projects to make your Workspace section at the sidebar more organized.
Hover over the project name and click on the hide icon. You will find all the hidden projects at the bottom of the Workspace section.
To move the project back its original position at the Projects section, click on the reshow icon when hovering over the project name.