yes, you need to put a STATIC IP in the OMV interface (and mask and gateway etc)
if you already have an IP reservation in the router, then it needs to be the same IP, otherwise the OMV machine will request an IP but the router reserved another IP so they might not understand each other
alternatively, you can delete the IP reservation from the router, but in my experience it is better to leave it also there so that the router does not assign it to some other device when OMV is shutdown or disconnected.
this is how I have it in OMV - 192.168.1.14 is the IP of the OMV machine and it is also reserved in the router
PS don't forget to also put DNS 184.108.40.206 in the OMV bridge; this is not required for the VM, but it avoids some issues on the OMV side in general (i.e. radarr/sonarr sometimes do not work without this)
Good day! I do as you say, but does not allow you to choose a device. in the Bridge settings, choose eno0? But it's confusing that I can't choose a device