Apple - Move Window by clicking on any part (as on Linux)?

You can use the free utility called "Easy Move+Resize", which allows you to use Cmd + Ctrl + Left click anywhere inside a window to move it. The modifier keys can be customized so that you can choose for example Alt + Left click instead.

You can download the utility from here:

https://github.com/dmarcotte/easy-move-resize

Read under the heading "Installation".

If you have High Sierra or later you can do this natively with macOS, no 3rd party app required:

Run this command in terminal to enable Ctrl + Cmd + Click in any window to move. Restart after.

# to add
defaults write -g NSWindowShouldDragOnGesture -bool true   

Run this command in terminal to remove this functionality. Restart after.

# to remove
defaults delete -g NSWindowShouldDragOnGesture

sourced from http://www.mackungfu.org/UsabilityhackClickdraganywhereinmacOSwindowstomovethem