Thank you for contacting us and I'm sorry about the issue you are experiencing. mSecure 5 displays fonts according to your device's settings. To increase to font size in mSecure 5, you'll have to increase the font size for your device.
Android > Settings > Accessibility > Vision > Screen zoom and font > Change Font Size
I'm sorry, but the response given here is completely unacceptable. While the general font size on a device may be suitable for most purposes , if a certain app requires the flexibility to enlarge the viewport as requested, it shouldn't require a change to the overall device settings as a result of which all apps would be affected.
I agree with the OP that the fontsize in Msecure is often too small to properly read back the recorded information; this is especially true when it comes to complicated passwords that are much harder to accurately read then common words.
It can't be too hard to implement this functionality and I would think that it would be very much appreciated by a large number of your users.