You can delete all the files inside the data folder to clean up and start fresh.
To open the data folder, you can go to Filezo Settings (Advanced tab). Then exit Filezo , delete all the files from the data folder and re-run Filezo .
If you don't have access to Filezo app, open the folder %appdata%\Conceptworld\Filezo in Windows Explorer (File Explorer). This is the Filezo data folder where Filezo stores all the data. Copy the above path and paste it in Windows search bar and open it.