State of the main window doesn't work

Hello,

I’m new to ExeOuput PHP, but so far I had much fun with it. All the features seems to work well for me, except one.
For some reason my compiled application is ignoring any settings of “state of the main window”. It just shows default window for the text (or other small content) and if I use CSS, it actually gets bigger, but unfortunately I can’t make it smaller or change proportions.
For example, I need to build a messenger application and window for it has to be narrow but tall and I’m unable to achieve this even with the blank app, without any internal styling.
Also, I’ve tried other PC with the fresh installation and result is the same.
What could possibly be a cause?

Thanks

Okay, I’ve just realized that once you uncheck “Save user defined position” initial window size gets as you set it.

At this point I’ve got another question. Is there a way to dynamically change a window size?
For example, at the beginning I have a login screen, which is small and after user proceed to the app itself, it should get bigger. What is the best way to do this?