which component to disable to reduce the size of program?

[umnbr]

i use windows 10 and used

windeployqt --qmldir <path-to-app-qml-files> <path-to-app-binary>
how to reduce my program size?

[wysota]

You can build custom Qt libraries with stripped-down functionality and deploy them with your program.

[umnbr]

You can build custom Qt libraries with stripped-down functionality and deploy them with your program.

how to do that?

[wysota]

You can start here:

Configure Options

Then you can build and use qconfig tool to fine tune features. Here is an equivalent docs for Qt4 (I can't find it in Qt5 docs): Fine Tuning Features