When connecting via ssh to a remote computer and then closing the ssh connection closes also the terminal and stops what is in progress. Within the ssh console the program screen (install it with sudo apt install screen) allows to connect to a local terminal (screen session) using screen -S <name>, run commands and then detach Ctrl+d (or Ctrl+a followed by d), screen -ls shows the sessions and session ID's and later on re-attach screen -r or screen -r <session ID>

Ctrl+a ? gives help