I cannot find my newly-created ubuntu directory

I have microsoft 10. I just downloaded the ubuntu app from the microsoft store. I just created a directory called prep-work in ubuntu’s shell. I then went to visual code and made notes about a program that is linked to the ubuntu shell (or prep-work directory). However, when I go to the search directory and go into the file explorer I cannot find the ubuntu file at all. I know the file exists because when I try to make the prep-work file again in Ubuntu’s shell, it says it cannot do so because the file already exists. How can I locate this file?

also, what is the command I can use to make sure that I am in the prep-work directory? when i type the command pwd i cannot tell if I am in there or so. I am confused.

Please help. Thank you