The interface doesn't update immediatly after marking a session as 'Done'

Actual
On a planned training session, I did not have a device to record it, but I have done it.
On the calendar, I click on the planned session, I mark it as done
The interface gives no feedback
I close the planned session window
I don’t see the session as done
So I redo the process several times (3)
When I reload the page
I see 4 sessions as done.

Expected
After I mark the session as Done
I should see a Toaster that says ‘session marked as Done’
And when I close the planned session window
I should see right away on the calendar this session with Done status

Tech specs
Browser : Brave - Version 1.61.100 Chromium: 120.0.6099.62 (Build officiel) (arm64)
OS : Mac OS Sonoma 14.4