To change the mouse pointer size on Windows 10, use these steps:
Open Settings on Windows 10.
Click on Ease of Access.
Click on Cursor & pointer.
Under the “Change pointer size and color” section, use the slider to select a pointer size.
Change mouse pointer size using Settings app.
Click 'Additonal Mouse options'. (It's on the right).
Select the 'Pointers' tab.
Under 'Scheme', select 'Windows Default (large) (system scheme)' or, if you want a really big cursor, try 'Windows Default (extra large) (system scheme)'.
That is brilliant, alavanalf. I have struggled for years because due to cataracts I could not see a white cursor on a white background. Thank you so much.