Center text in main editor

I like using Bear in full screen to minimise distractions, but unless I’m hiding all the sidebars, that means that the text in the editor is not centred on the screen since all the sidebars are on the left.

I would appreciate an option – or even a default behaviour when used in full screen – to centre the text when there’s space available in the editor window.

To illustrate this, here’s what it looks like now:

This is what I’m proposing: