Hi! Not in the Illustrator sense — Adobe Express doesn't have artboards. The closest equivalent is multiple pages in one design:
1. Click Add page at the bottom of the editor (or the + icon in the Pages panel).
2. Choose Same size to add a page like the current one, or Custom size if you want a different size.
3. Each page works like a separate canvas, and you can reorder or duplicate pages from the Pages panel. A design can have up to 99 pages.
Full details here: https://helpx.adobe.com/express/web/arrange-layers-and-pages/add-pages.html
If you need true artboards side by side, Illustrator is the tool for that — you can then bring the artwork into Express.