4. Other functions:
a. Reset the current layer key-codes: Pn + R
b. Reset all layers’ key-codes and restore to default: L_Alt + R_Alt
c. Swap Fn or Pn position:
Hit Fn + L_Shift for 3 seconds then select new Fn key directly
Hit Pn + L_Shift for 3 seconds then select new Pn key directly