How any widget/frame/button to be displayed/look like outside boundary of main window

[santosh.kumar]

Hi

Please see the attached screenshots of software clean my Mac(Dummy-min.jpg)
I have to create same screen for my application.
This window contains two specific widget - one vertical frame containing a lot of options - showing outside the boundary of main window.
second Scan button is showing outside the boundary of main window.

Please help me or guide me that how we can create like this type of windows.
I am using Qt 5.14 for MacOS.

Please reply.