The app doesn't work

[UnixCro]

Your idea is really very good, but unfortunately you have to fix problems with the app.
I downloaded the last version of the app. The registration was successful, but the first thing I noticed was that you couldn't enlarge the window. Was that on purpose? Then I noticed the enlarge symbol, so the standard green to enlarge the window looked kind of broken? In addition, the app does not start properly, nothing is displayed after logging in, it does not matter how often you restart it or how often you delete the data from Application Support, Saved Application State in order to fix the problem.
Please solve this
thanks