The Access Protection policies won't affect On Access or On Demand scans; you'd need to modify the On Access policy or the On Demand client task assignment to do that.
I Create one subgroup separately under system tree to disable on access and on demand scan task and change the policies for this reason. in assigned policies I can only change the policy and in client task policy there is no policy to change virus scan into disable. SO I do that task correctly. but my problem is that when I insert my systems into this subgroup in view assigned policy, it shows that it is applied but in reality it is not. I did this process like below:
Any chance you have any rule based policy assignments? You should be able to select the system in the System Tree and go to Directory Management --> View Assigned Policies to see if there are any rules overriding the policy assignments.
Otherwise, what settings are in the "Disable" policies in your screenshot? What are you setting to disabled VSE?