How to locate, download, install, & manage your fonts in Microsoft Office (including Word, PowerPoint, Excel, Outlook, etc.) ...

Yes, there is a checkmark symbol in PowerPoint, and you can insert it using the Wingdings characters. Go to Insert > Symbol, then scroll down until you find the checkmark symbol you want.

You can hide and unhide a PowerPoint slide by right-clicking it in the sidebar. You can still view any hidden slides while you're in presentation mode — they'll appear gray or show a null symbol ...