You can do the following:
2) In the FIND filter, select VIA
3) Select the via
4) Add the property "No Shape Connect"
This will disconnect the via from all the ground layers. Now you can route the connection on the plane layers you want.
Or if you want this for all of your ground vias, you can use a custom via that does not connect on certain layers. Be sure to add that custom via to the available via list in the constraint manager for that net.