HI
Beginner here.
Office 2019
Within a cell, left and right keyboard arrows move the cursor one character, fine. They stop at the ends of the cell.

But Up arrow moves to start of cell and Down arrow to the end of the text in the cell.
Both the dedicated arrows keys and the keypad keys (with numlock off) do the same.

Scroll lock has no effect.

This means using the mouse to navigate around the page.

This has to be finger trouble, right? But I think I've searched enough.

What the heck am I missing!!??

I've tried rebooting and Repairing from MS.