Today I cut (ctrl+x) a file from the desktop and wanted to paste it in /home/user/Downloads/Documents/. But when I tried to paste it says there is no file on that directory. I checked the desktop and the file is gone from the desktop too. Where can I find the file?
Update: I got the file. Libre Office somehow recovered it.
You can launch either file manager that you wish, either from the App Menu or from the App Finder (alt+F2)
You can only set one as default, however. Thunar is set as default... by default. But you can change that to Nemo. And if you change your mind later, you can remove the default setting for Nemo.