How to recover unsaved excel file.
You can find your unsaved excel files by following these steps:
1- Click in Windows search then type This pc and click on it.
2- Double click in Local Disk (C:)

3- Chose Users folder:

4- Double click in Your_username profile:

5- In the above bar, you will find a View option, click in it:

6- then check on the hidden items box:

7- After checking the hidden items you will find a folder under the name {AppData }, open it:

8- then open (Local) folder:

9- search for a Microsoft folder and open it:

10- then office:

11- you will find a folder that name is UnsavedFiles,
Open it and you will find the unsaved file from Excel.