Hi Syamsu,
If you reduce your font-size too much then it becomes unreadable and provides a bad experience to the user.
May I propose a different approach? Perhaps a Show more / Show less pattern?
It is very easy to implement and it provides a good variation of showing little text and only show more on demand by the user.
In order to implement it, you just need a local variable to control if it is in compact or expanded view and show the first X characters of the text using Substr function or the full text.
Alternatively, you can use Tooltip from OutSystems UI, to allow the user to see the full text on a balloon on click:

Regards,
João