Why can't I find the aircraft, tanks and ships of World War II in the mission editor? Is it a version 2.7 bug?

[huchanronaa]

Why can’t I find World War II aircraft, tanks, ships and other equipment in the mission editor? Is it a version 2.7 bug? I can’t find aircraft like p-47 and put it into the mission editor

[Flappie]

Ensure history mode is disabled (clock icon atthe bottom of the screen), or simply set the correct mission time (e.g. 1945).