[Mac][PC]Microsoft Office Word/Powerpoint can't delete words.

This happens especially when you are tracking your changes. Sometimes you can modify your texts by "highlight and type". Fixes:

Mac,

TOOLS>TRACK CHANGES> HIGHLIGHT CHANGES>OPTIONS> SHOW ALL> EDIT> CLICK "DELETE SELECT TEXT WHEN YOU TYPE" 


PC,
Tools>Options>Edit and check Typing replaces selection


For further information, please read this:
https://www.cnet.com/forums/discussions/backspace-button-won-t-delete-text-in-ms-word-308881/