Change a resource from Multi-mixed to Single-Mixed

Do we have any way to change a resource from Multi-mixed to Single-Mixed (or Single-Mixed to Multi-Mixed?) other than by deleting the capacity in ECC?

I see that un-checking the box ‘’Can be used by several operations’’ and CIFing the resource over to APO doesn’t change the resource from Multi-mixed to Single-Mixed. Want to explore other options, if any, to do it if possible.