Here is the list of my mods (RealNames is for BDB which I haven't added yet, I was checking if the button will go away if I remove most of my mods):
And here's an image of the problem I have, all this button does is contain a list of all parts (including mods):
I have no idea how to get rid of it, any help?
EDIT: The button mentioned is the beige teardrop on the left
EDIT 2 (oof): I play on 1.4.5