When sketching, the Convert Entities dialogue does not seem to let me select all sketch entities at once.

Dragging a box across all entities doe not pick any of them. 

(no drag box appears once inside the dialogue, and dragging a box before the dialogue selects nothing anyway)

Pressing Crtl-A or Edit>Select All does nothing, despite Google AI saying otherwise. (Artificial Incompetence)

Is it just me or is there no way to select all entities?