Remote accesing/controlling employee computer

Hi! I am not sure how to go about the following. I currently have a small company (under 10 employees) that I run semi-remotely and we started to implement workstations for administrative roles where I would like to have access to everything that is done on these workstations due to some issues we have had in the past that we want to avoid. basically an ex-employee quit and decided not to hand over all of the information and work she had done over 2 years.

We have a partner that is always on-site but he is not the greatest with computers so I was tasked with looking into this. My hope is that I can remote access the computer and pull documents, data and maybe manage some of the software and permissions on those workstations. What would be the easiest way to manage this?

Thanks!