customizing variables, text size etc

Hello,

Firstly,
Congrats on having such a good peice of software.
i personally have had my horizons broadened as a result
of this software, the visual aspect greatly assists conceptual
development of what i am trying to represent as a model

Secondly,
i have a largeish model with lots of variables and flows etc
i seem to have a problem at the moment because i have to
customize the text and line sizes and so on every time i enter
the model as it doesnt seem to be saving these customizations

is there a way to avoid the line and text sizes etc going back to
a default value every time i open it?

LS