View and edit permissions for each project or team resource are managed by the individual integration (e.g. Slack, Confluence, Box, etc.). You’ll only be able to see messages, files and resources that you have access to.
If you don’t have access to those resources, you’ll be able to see them on the search results, but you’ll need to request access in order to view, comment or edit them.
Don’t worry — you (or your coworkers) won’t be able to find or access files that are stored in your personal folders or Slack channels.