Thank you for your feedback. We will definitely have it into consideration for future AppBuilder releases. Further, you can also submit the idea on our Feedback and Ideas portal
. This will allow other Telerik Platform users to vote and subscribe to the item.
Until we introduce a way to enlarge the fonts from within our client, could you please, check if zooming in/out the page works for you. In most of the browsers Ctrl + Mouse Scroll Wheel
does this. I hope it helps.