Create a new user in linux that does not have access to old user’s applications

I am using Manjaro, I have a admin account with virt-manager installed to it. But I want to make some modifications to virt-manager package and build it again. I want to do this in a new account, because I cannot disturb the existing package in admin account. I want to make a new user account, that is similar to one that comes with a fresh install,no extra programs pre-installed. and doing anything here, should not affect things in admin account. I tried to create a new group and a new user but virt-manager was accessible through that account, which I have to prevent. In windows, this was easy, but linux is all merged, Can someone help?