I see the name of the view php file at top of page

I'm getting used to CI4 and enjoying the ride, but there are gaps in my knowledge. I have obviously changed a setting, but I don't know what I did.
I am in development mode/ At the top of each page that is rendered on the host machine, I see the name of the php view displayed above my content in an orange band and there is a thin orange line making a frame around my content above the CI debug toolbar.
The debug toolbar displays when I connect from another machine on my network, but the view file name and the orange line around the page are not rendered there.
As this is a bit distracting on my development box, I would like to switch it off. Can anyone tell me what setting in which file I need to correct?