I am using AEM 6.3.3. As per below documentation, we should be able to to author fragment using full screen mode editor. But I don't see any option on content fragment to change the editor to full mode. Is there some configuration that needs to be enabled to have full screen editor feature in content fragments?
You could use the "Toggle Side Panel" button on the top to make it full screen.
The screenshot is taken from 6.4 instance. I just checked my 6.3 & 6.4 instances for same. My 126.96.36.199 is same as your screenshot.
Side panel in my screenshot is already expended. If I click Toggle button, it minimizes the side panel. Below is the screenshot on clicking of toggle button.
I want to maximize the Rich Text editor to have all the controls but can't find a way.
Per my understanding, toggle side panel is the only option available to make RTE full-screen. When you want to apply any available RTE cmds then you can toggle and shrink the width.
You can't have a maximize button in this case because the RTE plugins/commands are in the left rail and not on the top like AEM 6.4
Hope that makes sense.
It would be helpful if 6.3 documentation is updated with proper screenshots. Right now it has same content as 6.4 which is not correct.