mastersian I will need to think about some sort of built-in tutorial, as this appears to be pretty frequent question. Yes, it is possible to accept multiple or even all suggestions, but in order to do so you will need to select faces first. You can do that with selecting images with pressed down shift key, or select all using context menu or Ctrl+A shortcut. Then, using context menu you can apply similar command to all selected faces or images at once. That includes accepting suggestions.
