Noob question, I've lost the right side panel to access all the assets

Hey all!

I've been given a link to a mobile app design in adobe XD, and it worked fantastically. But over the past couple of days, I no longer have access to the right side panel where I can download assets, see colour values and such. I've tried everything I can, and unfortunately can't get in touch with my designer colleague for a few days. Can anyone point me in the right direction?

Thanks!