My 3D printer won't arrive until next week so I'd like to spend this time learning how to use Cara, but Cara won't start until it's connected to a printer. Can I use it without a printer? Or do I have to spend time learning Cara after my printer arrives and before I can do anything useful with it? Maybe I should not have given it all those permissions, but I can't undo them now. I'm using the latest version of Cara for MacOS.