Pia, thanks for the prompt reply.  That wasn't the answer, but it did lead to
the solution.  The options you suggested were already in place.

What worked was go to Office/Powerpoint//View/Slide Master.  Then select the
slide with the desired layout, select the text box in the slide, right mouse,
Format Shape, Textbox and choose Shrink Text on Overflow.

One has to repeat that for each text box of each layout where the resizing
of text is desired.

One could also do this in Normal View by selecting the text box and then
making the choices above.