Rhythm parts often repeat two bars at a time rather than one. You can now write that with a proper two bar repeat symbol, instead of copying the bars out by hand.

• Add it from the notation tools and the symbol spans the two bars it stands for, drawn the way a player expects to read it.
• Playback follows the repeat, so what you hear matches what is on the page.

It sits alongside the single bar repeat that was already there, and works the same way.