From what I can see from your screenshot, that is a behaviour tree which is running an EQS and that param has been set so that its value can be decided from the BT task. Is that correct?
In this case, you can set the desired value from the BT task directly, through the “value” field or through the blackboard “BBKey” field.
If you want that parameter to be the same every time the query is executed, you have to remove the binding from the env query and that should allow you to set the parameter.
Is this what you wanted to know?