Remove Cplane relationship with object

I somehow have created a C-plane relationship with the highlighted object

this image above show the C-plane at world top. If I were to move this highlighted object the cplane snaps to it as shown below.

What is this relationship and how do I break it so the c-plane wont update every time the object needs moved.

I know this a new feature in rhino 8 called auto C-plane but I’m running Rhino 7 so I’m unsure what I did and how I can reverse it.

38-Aft-Bench 2.3dm (1.1 MB)

you likely have auto cplane enabled-

auto C-plane is a Rhino 8 function. I’m on Rhino 7, I don’t have that function

can you post your file or an example file that shows this behavior?

38-Aft-Bench 2.3dm (1.1 MB)

run the Mplane command and detach the Mobile Construction Plane from the Rhino Object.

looks like you may have set a mobile cplane to the object,
exploding the part and rejoining it removes that behavior here..

or you can detach the mobile cplane in the mobile cplane command line