Can people with "editor" access still mark tasks as complete? or do they have to be users to do that

edited 12/08/23 in Smartsheet Basics

I am trying to decide if smartsheets is the platform I want to use for project management of my team. I am a little confused about what a viewer can do versus what a user can do. Can people with the free "viewer" access still mark tasks as "in progress" or "complete?" Or is this only available for paid users on the plan?