Disable Uplink Balancing / Multipath Rules Issue


I have automatically enabled uplink balancing in my Sophos. I use multi path rules to be able to change internet traffic to External WAN Interface or to route traffic over VPN Connection Interface. (VPN Router is in DMZ)


Example Multipath Rule:

MAC    Any    Internet IPv4 
  External (WAN) 

switching Rule On:

MAC    Any    Internet IPv4 
  VPN Network 


I tried now to disable Uplink balancing, but this set my defined multi path rules by bind interface to undefined.

When Uplink balancing is disabled, I also have the issue that I cannot choose anymore between the VPN Interface and External WAN Interface.

Can someone please help me how can I disable Uplink Balancing, but still be able to route traffic via Interface?