DC-DC Converter 12V->5V

I would guess that you are using the original version. For me (because I moved the pads to make it so) it fits the breadboard and connects. Make sure the part you are using has the url in Inspector (circled in green on the lower right of the screen) as the original doesn’t have a url and that area will be blank.

As you see mine connects correctly to the breadboard (4 green rows indicating connected.) On your image the left pins are red (unconnected.) You also appear to have a short from VIn to Vout which is not correct

edit:

interesting, for me even the original connects to breadboard (it is apparently close enough!)

as you see it has Part1 rather than A1 as its label and no url. You might check that your grid size is the standard 0.1in (View->set Grid size) as if you have an odd value set that may be enough to make it not work.

Peter