Starting application without top application bar

Hello,
I have a windows apllication with some shortcuts on the top bar as seen here:
Screenshot%20from%202019-06-03%2019-02-38

when i maximize the window, a top bar is covering the bar of the application:
Screenshot%20from%202019-06-03%2019-02-48

How can i change this behaviour. Are there start arguments i can use?