I'm not sure if an administrator can see my screen while I use my computer, can someone provide an answer with an explanation of how they can do it? I have an administrator on my computer, but not school level security where they have things installed.
An administrator can install whatever software they want on the computer. This could include screen recording software (or keyloggers, mouse movement trackers, audio recordings, camera recordings, programs that make copies of your files, software that inserts typos, and so on). There is really no limit as to what they can do regarding installing software, with or without your knowledge.
But whether or not they have actually installed such software is between you and the administrator.
Yes it is true and 99% chance that your administrator has installed some software which can have access to your screen. I remember once i used to work for a company and they used to control there users screen. They watches what they do. But again it depends on the policy of the company and entirely on the admin of the company.