setting

when cd /folder/folder/folder, the full path will show, how to setting show target folder instead of full path ?
e.g.

$root@Jan-pc:~# cd /usr/local/sbin
$root@Jan-pc:/usr/local/sbin#

expected it show below:
$root@Jan-pc: sbin#

if show full path it will longer and longer

The issue names no source file, test, or entry point. Start by locating the terminal prompt and working-directory display settings, then determine whether the prompt can show only the current directory name; done means a configured prompt displays `sbin` instead of `/usr/local/sbin` after changing directories.

Written by the indexing model from the issue text.