A stop manager works in the background. So what did it do, and when? In 3.1 the row tells you: after a stop change it shows "SL updated" for a minute, and the detail line names the old stop, the new stop and the time.
The core stays: the manager only ever tightens a stop. While the structure runs against your trade, your own stop does the work.
If you own the manager, 3.1 is a free update in the MQL5 Market. New to it? Until Sunday 25 October it is 59 USD instead of 79. Have a look.
Daniel