MsPaint vs MyPaint the Open Sores Clone

Try to select an area in MyPaint.
Can't find it in menu or buttons.
Turn out its impossible.
Such advanced feature as MsPaint rectangle selection doesn't exist.
The issue is 4 years old now.
https://github.com/mypaint/mypaint/issues/31

These are open source dubs. They're free, but inferior quality and provided without any warranty. Should you encounter an issue with them, the community will be rude to you because you're a mere muggle.