One bar staff - how to pull to edge of frame?

Hi - I’m sure I’m missing something really obvious here but I’m just trying to setup some student exercises where I want a music frame to fill half the page horizontally, and the other half will be a text frame.

I just want to be able to pull a one bar staff (bottom system) all the way to the side of the frame - as the previous systems are (see attachment). I turned on the ‘staff spacing’ button but that only seems allow vertical movement.
Staff.jpg
Any assistance greatly appreciated.

Cheers

You should untick “Only justify last system…” in layout options, Note spacing.

Awesome! Thanks Marc