Hey there Vijayforart,
We appreciate you reaching out to us today about your iPad and your concern about storage space.
Your Files app does appear to contain a large amount of data. In order to remove it, you will need to open the dedicated app on your iPad.
There is a great article here that can help you to free up space inside of your Files app directly: Use the Files app on your iPhone, iPad, or iPod touch - Apple Support
If you visit the section "Delete files" it includes information about how to manually select and delete any items you no longer use, as well as view the "On My iPad" folder.
If you have any other questions, reach out to us at your leisure.
Have an awesome day!