Menu dropdown being truncated on click

Trying to sort my way around Blocs by re-creating some of my existing sites I’ve neglected for a while.
Got Menus working, kind of, finally sorting how to enable them properly, and while I have adjusting the padding as default for desktop is just way too much spacing, I haven’t modified with custom CSS at this point.

The drop-down for the menu seems to be getting truncated at the bottom of the nav block, with obvious reasons to not want to add a ton of whitespace. Am I missing something obvious here? I’m assuming it’s due to the settings on the bloc area or underlying div, but I’m pretty sure this is doable easy enough in bootstrap without having to create padding in excess of e.g. a multiple entry menu.