The text content is too small in mobile view...

Can we increase it ...  only the content - not the title

Has any 1 changed it .... what are the best practices ?

Add the font-size attribute below the line-height in custom.css:

@media screen and (max-width: 767px) {
  .ipsType_normal.ipsType_richText {
  line-height: 1.6;
  font-size: 14px;
  }
}

You can adjust the size to 14px or 15px or whatever.

will this work in 4.5 as well or only for 4.4

Perhaps for both.