When enlarging grouped objects how to enlarge size of text as well in PPT 2019

On forming a group of objects using the grouping option you will notice that text in a text box will not be adjusted.

After adjusting the group using the handles the text size stays 36 pt.

If you want the size to change you can copy and paste the group as an EMF file. 

Now you can adjust the group and the text size will follow.

As a bonus the objects stay editable after pasting the group. But expect some side effects when handling them.

Text effects like shadow and glow can lead to a reduction in quality. Best to avoid those.