I am using a screenshot tool "hardcopy" that adds a button to the title bar of every window. With Display Fusion another button was added to the title bar. Now the hardcopy button is partially covered, see attachment. It is difficult to click the hardcopy button now.

It would be very useful when Display Fusion would place their button a bit more to the left.

Or, if there is a expert solution with modifying an .ini file or something to specify the exact position... is welcome!

Go into the settings menu, and click on the 'Compatibility' button on the left (3rd from bottom). Click the 'Add' button, select your program, then you can modify the title bar offset for a normal and maximized window.

Thank you very much for your quick answer!
Also thanks to gamex, so I have learned a new feature.

It works

Btw: Can I even disable the Display Fusion Button in title bar? At the moment I don't know for what should I use the button.