Snap to Grid and using mouse to select multiple objects.s

My questions are so basic... I cannot figure out how to get images to snap to grid in Storyline 360.  They snap to each other, but then I cannot snap to the center of the page.  Also, I cannot select multiple objects with the mouse.  I have parallels, so the buttons are different than a windows keyboard, but none (shift/fn/ctrl/option/command + mouse/trackpad) select any objects.  So to select a handful of objects, I need to click a handful of times.  

It's kinda driving me nuts... I understand many of the more advanced features but I am clunking around with the very basics.  All that said, is there a resource that explains all such things, specifically for a parallels environment? 

 

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