How do I set the screen timeout?

I am trying to set the screen timeout so that the computer does not timeout during transfer of a large file. How do I set the screen timeout?

Select the System Settings from the icon located on the far right in your top panel. Once there select the Brightness & Lock settings. It will look as I've shown below. Change the "Turn screen off when inactive for" to never, and change the "Lock Screen" switch to off.

In 18.04 it looks like this...

I'm not exactly sure what I'm running, but it might help someone else to know that I found it under Settings Manager → Power Manager → Display.

If you want to turn off the screen lock, run:

gsettings set org.gnome.desktop.screensaver lock-enabled false