1. In a Git repository with unstaged files, right-click on a file and click "Log selected".
2. The "Log" window should appear maximised. Observe that the window can't be resized or moved. In a a multi-monitor setup it is stuck to one monitor.

There is a way to make the window movable and resizeable:

1. Observe that the icons in the top right of the window initially are "minimise", "maximise", and "close".
2. Click the "maximise" button. Nothing will happen.
3. Click the "minimise" button.
4. Restore the window (e.g. by Alt-Tabbing to it).
5. Observe that the "maximise" button has become a "restore" button. Click it.
6. The window size becomes smaller, and the window can now be resized and moved.

After doing this the window will retain its last size. However, it won't retain its position, so if I drag it to a second monitor, it will always open back up on the first monitor.