Thank you for your response,
I believe in the earlier versions of WP, the option to change the size of embedded video was in the Settings>Media section. Which is now gone.
I managed to alter the max size of the iframe from within the editor by doing a ctrl -f search of the term ‘iframe’
which found this. #article iframe {width: 100%;
I changed the 100% to 50% and this worked.
Is this the only way to change the size values of embedded video?
