Instead of clicking on the small little "X" on the folder you can actually swipe from the center of the bottom bezel to the left side of the PlayBook (see image above). Doing so will cause the folder to quickly close letting you get back to what's important, using your PlayBook. Now this has got me thinking, what other secrets are laying within the PlayBook OS 2.0? If you've found one let CrackBerry Nation know in the comments or in the forums at the link below. It'll be interesting to see what else can be found.
Familiarize yourself with other Tips and Tricks from the forums

A new 5G BlackBerry Android smartphone with a keyboard will arrive in 2021
A new joint announcement from BlackBerry, OnwardMobility, and FIH Mobile lays out the plans for a new 5G BlackBerry Android smartphone with a physical keyboard to be brought to market in North America, and Europe within the first half of 2021.