You can write what is better to do there
The IPS wiki page gives info on setting it up.
https://wiki.ipfire.org/configuration/firewall/ips
There are also a couple of pages on the rulesets and the rule selection.
https://wiki.ipfire.org/configuration/firewall/ips/rulesets
https://wiki.ipfire.org/configuration/firewall/ips/rule-selection
There is also this IPFire Blog post on IPS configuration that is worth a read through.
https://blog.ipfire.org/post/ips-configuration-recommendations-for-ipfire-users
3 Likes