Here are the only lines of code in my project
Wow, you have an entire application that runs with only two methods of one line each? No header files, no main.cpp, no MainWindow constructor? Amazing.

Showing screenshots of Qt Designer in meaningless. All it shows is that you've specified a UI file for your project. The problem is almost certainly not in the layout of your GUI, it is in how you are connecting the signals and slots of the various UI components and what you are doing in those slots.