Dear Libre Office, I am sorry to say, I have Stopped Using Libre Office 25.2. I had way too many problems with storing documents, closing down, etc. I found in many cases documents I had stored could not be opened, or were not in the memory. I have gone back to using OpenOffice 4.1.15 which was much more reliable.
As far as I can see, you are using Windows XP and xlsx on USB sticks. Good riddance with Apache OpenOffice!