Finding the forms for existing sheet

MSOEM
✭✭
The system is running for a few years, and I am new to Smartsheet.
The user will input the form, and those inputs will go to specific sheet. I just want to find out which form it is using. I click on Forms> Manage Forms > No active form is shown.
So, I am wondering how to find the inputs are coming from.
Thank you
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