U3824DW, PIP shortcut key use and how to find?

Likely something I am missing but so help me I cannot find the solution. 

I am running this monitor with another brand of laptop (Lenovo) for work. In reading the supporting manual for the monitor and reviewing the on screen menu, I see the ability to shift/change PIP display settings through the use of numbered shortcut keys. Would someone enlighten me the proper key strokes for the use of those shortcut keys as they apply to PIP settings?

As I states, I am sure this is something simple but I simply have zero clue after 4x through the monitor manual.

Thoughts welcome.

v/r

usmcordie