I looked in your project .aia using the Unchive and 7zip utilities.
Unchive tells me you have 26,000 blocks in all.
From the block images, it looks like you created a massive brochure, with text in Labels in Arrangements across multiple screens, with Buttons to control visibility.
Instead of using a procedure to close all the other Arrangements, you duplicated every Arrangement's visibility across every other Arrangement's control button.
Your Engine Compartment Screen is the biggest, followed by Tractor and Trailer.
How were you able to work on such big screens?
At this point, I see no other way to save this project other than by mass extraction of the text and their Arrangements, into table form for a separate viewing mechanism.
Here are a couple of examples of how to show lots of text without overwhelming the AI2 environment.