Are you suggesting I have no idea how to format image sizes??
Guilty as charged
No reason why you should know. It is one of those things which does not appear in any of the button functions.
You can resize either (or both) the width and the height. Practically, resize
only the width (and the height will adjust, proportionally, automatically). All you need to do is edit the opening image (IMG) tag. So, instead of:
[img]https://pbs.twimg.com/media/E4rldGXUUAE6N9X?format=jpg&name=large[/img]
You would edit the opening IMG tag:
[img width=500]https://pbs.twimg.com/media/E4rldGXUUAE6N9X?format=jpg&name=large[/img]
'500'usually works quite well.