Setting "Logon Activity Threshold" on cloud environment

You should be able to change this threshold, based upon your screen shot above.  Just uncheck the box in front of that metric and negative the -1, and then type your threshold in days.  For example, as shown below for 90 days.

If set to -1, no logon inactivity threshold is enforced. If set to 90, in contrast, any user who has not logged in during the past 90 days will be unable to access OneStream without an administrator’s intervention.