I exited back off the preview, switched off Default [modified] and back to Default and found some floaty text:

(Might have been there before I switched modes; I'm not sure)

This seems like added friction, requiring an added mouse click for what can be a very frequent operation, cleaning a blueprint from the cursor. Requiring a cursor move can also be disruptive if a player is trying to build multiple blueprints that are intended to be aligned with each other, e.g ...