Lightroom cloud on MacBook

Hi 

I've recently bought a 16 inch MacBook Pro and installed Lightroom (cloud version) synced photos arrived. The editing screen size is smaller than I'd like, please can the left hand side toolbar be collapsed? (I've researched online, I can see in Classic the toolbar can be collapsed but I can't work out how to do in Lightroom) it would create a bigger pic size... 

thank you