Descript supports multi-window editing. You can open multiple Descript windows by opening the menu in the top left and selecting File > New > Window.
If you're using Descript on the web, you can simply open another browser tab to edit your project in multiple windows.
This will open a new Drive View window. You can then open additional projects and compositions.
With multi-window editing, you can quickly copy sections of your media and text to another spot in your composition or another project without having to flip back and forth between sections.