Email header image

hi all, amateur hour over here, but, it's hindering my progress & i cant find anything in forums or docs.

I'm adding a full width image to my email build (i want to use this as a header) - but everytime i add m image, click swap - it adds padding to both sides f the image & i cant switch it off. is this to do with my email template used perhaps?

on another email i've tested it (using same template - i think), and it fills te full width of the email as i'd expect.

i dont want to clone this & start over as the mjority of the email is done, just the header image isnt right.

really simple thing but its stopped me in my tracks.

im not technical & don't want to get involved with code or anything.

any help appreciated

thanks in advance,

noob