Greta Shot of a P-40F Cockpit In N Africa

[MIflyer]

Pilot was Jazz Jaslow. Note how the Left side panel is hinged so it can be opened to provide a means of escape if the canopy jams.

 

[CATCH 22]

AFAIK this was a standard feature on all P-40 types. I remember discussing the small latch on the outside, used in case of a crash landing or turnover.
Usually one can find the description of this emergency panel in the pilot instructions.