ASUS Transformer Pad Infinity — can not add a shortcut icon from the apps list to home screen

i have ASUS ZenPad 3S 10 (Z500M) [model p027] and i can not add a shortcut icon from the apps list by pressing and dragging the icon from the all apps list.

i know i used to could do it so something has changed preventing it.

plz help.

if you're referring to screen lock, there is no screen lock - i am not sure what 'launcher' refers to.
yeah, i have figured it is not possible to make a shortcut from the master list from what i have read in faq's and queries across the net . . . it seems to me what is missing that the manual says should be there is that in the 'manage home' section the icon 'widgets' should be saying 'widgets and apps' but it only says 'widgets'.

maybe this is a clue, i also am not able to make a folder by dropping an app icon onto another or drop an app icon into an existing folder - the icon i'm trying to drop onto just 'jumps' out of the way.

ahh, forget that last statement - i was not moving the icon fast enough into an existing folder . . . red herring. but i can not for the life of me see why the 'widgets' icon in the 'manage home' home section does not say 'widgets and apps' - that is where the problem appears to be.