In recent releases, Bitcoin Core will automatically enable pruning the first time you start the GUI and it detects that there is not a lot of disk space. When you go through the first start wizard, be sure to pay attention to all of the checkboxes and uncheck the any that enable pruning. This setting is (unfortunately) stored separately from the datadir so when you copy datadirs to another machine, it is lost. If you create a bitcoin.conf file and add the line prune=0, this should forcibly disable pruning always so this doesn't happen. In that case, that setting will carry over as it is set in the bitcoin.conf file.