Currently, to duplicate the project, you have to select one page at a time in the Base box to copy and migrate. Here are instructions on how to copy and paste the page.
First, open the layers panel on the left side of the screen.
Then select Base at the top in the Layers panel and copy it with ⌘+C or Ctrl+C.
Please use ⌘+V or Ctrl+V to migrate each page in another project you are moving to.
When you paste the symbolized boxes, the symbolization will be canceled.
You can't copy CMS articles and properties as well. Therefore, you have to create them in the project.
When you paste the layers, the <div> Base will be pasted, so there will be 2 <div> Base on one page. You can delete it by press ⌘ + Shift + G or Ctrl + Shift + G with the <div> Base selected.