Switching to Play In Editor
While in a Simulate In Editor session, you can click on Possess in the Toolbar to switch to a Play In Editor session.
You will attach to the player controller, and begin a Play In Editor session in the active level viewport.
You can also press the Possess keyboard shortcut to switch to Play In Editor from Simulate In Editor. (default: F10)
If you began in-editor testing with a Simulate In Editor session, and then used Possess to attach to the player controller, you will begin
your Play In Editor session at the default player start. This is equivalent to selecting Play In > Viewport at > Default Player Start from the Play In dropdown menu.
However, if you had previously swapped from a Play In Editor session to a Simulate In Editor session, without leaving in-editor testing mode, when you click Possess,
you will re-attach to the player controller and resume gameplay at the location in the level where you previously clicked on Eject.