CSF 1210 CE FTD Event viewer problem

[Brunetta7]

Good morning everyone,
I noticed that on my CSF 1210 CE FTD, using the Firewall Device Manager, Monitoring - Event viewer section,
events are received and displayed only if the page is open.
It is not possible to view events that occurred when I am not connected to the firewall device manager (for example two hours before)
Is this normal behavior or is there a problem?
How can I view all the logs for which I have enabled tracking?
Thanks to anyone who can give me some information.
Have a nice day

[ahollifield]

Friends don't let friends use FDM. Use FMC.

[Brunetta7]

Sorry, I don't understand.

Does this mean that FDM is not working well and that to get the previous logs I have to use FMC or a SYSLOG Server?