after when should i raise the defense+ security level

i read the manual
but it’ s not very exhaustive, comprehensive, thorough, all-embracing

well now my comodo is setup to clean pc mode (i guess is the default)

when should i raise up the level

i know the in the mode clean pc mode , comodo trusts about the programs installed but not the new programs

well , how can i know if comodo learned the all my programs installed ?

i mean now my pc is safe , when should be i raise the level to check the new programs?

CFP learns when the programs have been executed once. I execute all programs I use once, in Clean PC Mode, then I raise the level one step to Train with Safe Mode.