Where in wow do I enable modiers? like shift/cntrl/alt?

I never had this issue before, but since I came back a few days ago, my modifiers do not work.

so with certain macros here, they are programmed to use shft/alt/cntrl for certain abilities.

I’ve looked in wow options keybinding, but I see no modifier enabler. that specifically allows the use of stand alone shft/cntrl/alt.

any help much appreciated