Note: Please, do this before deleting any files/ folders from your computer.
1. Click on the Dropbox icon at the top-right side of the screen.
2. Click on your initials and then click on 'Preferences'.
3. Click on the 'Sync' (1) tab and then make sure you are on the Life.Church tab (2). Click on 'Select Folders'.
4. De-select all folders that you do not want your computer to sync with Dropbox, and then click 'Update'.
5. Once that's done, you can erase the files on your computer and it will not affect the files in Dropbox.
After doing these steps, if any file is added to the Dropbox folder, it will not show on your computer. And if any file is added/ deleted on your computer, it will not affect those on Dropbox either.