Test Cases not found under a certain folder

I tried opening a test case under folder name : “Deposit” but when I open it, all my test cases are gone. I tried to open the project folder location and I found all the test cases under it. (Please refer to the image provided below).

My question is:
Is there any way that I can open it again or import the test cases?
What is the reason that the test cases are gone on the studio?

katalon1.png

the test cases are just simply xml files containing metadata.
the actual steps to execute are in the “Scripts” folder, you have to import those too

@Ibus thank you so much for taking time to reply my post. Actually I found a way to open my project/test cases. You just have to open project and locate the file folder to be able to open it.