[Qt Creator] default build directory changing

as you can see below the screenshot (after build), when I compile/build my app, Qt Creator generate the build directory level as same as ../%project_directory/ level. it looks dirty for me. so I tried to change this with OPTIONS > build&run > General Tab > ‘Default build directory’(setting in option, screenshot below) but it’s not working.

[after build]

[setting in option]

how can I change this setting in Qt Creator ?


*Added

I found change the directory in project properties panel. but it seems like I have to do this everytime generate a new project.
any help?

the general setting in options > build & run should work, i have it set to obj and my object files end up in an obj folder inside the project

I checked again, it works!
thanks for fast response.