Remove logo

[Costasptc]

I am new to OBS. Following a video on youtube that I can find again, I inserted a logo that is too big on the the main camera. I can not find where it is to remove it. it is not an added image under Sources. It is added somewhere as a default logo.
Does anybody know were in OBS you can add a logo globaly. I need to remove it.
Thanks

 

[koala]

It might have been added by a "Image mask/blend" filter attached to one of your sources.

 

[Costasptc]

can it be in my cameras device source?