In case you've accidentally removed a design you can recover it from the Trash section.
To do this just click on your user icon in the top right corner, and from the Drop down menu select Trash
Once there, just search for the design which you'd like to recover and click on Restore
This will place the design back into its original location.
Please note that removed designs and folders are kept for 30 days in trash, if they aren't restored during this period they will get deleted forever without the possibility of recovery
In case you'd like to speed up this process, or just want to keep the Trash section empty, you can click on the Delete button to completely remove the design