If a dynamic port is enabled, you can now make iManage Drive reuse the previously used port number by using the following configuration:
local_rest_service_port: 0
NOTE: If you've enabled a dynamic port, web extensions won't work. So, users won't be able to sync their files directly from iManage Work.
From iManage Drive 10.10.0 onward, iManage Drive for Mac automatically selects a dynamic port if the defined port is in use by another process.