partitioning - USB Drive missing space, no unallocated space found in Device Manager

I followed the link below to try and fix this issue but unfortuantly DiskPart, GParted or any other method has been unsuccessful. It's a 32GB flash drive and I'm seeing 1.8GB. Any ways of totally wiping and reformatting this to a stock flash drive?

16 GB USB flash drive capacity down to 938 MB