There isn't a way to toggle that filter and the information required to create statistics which are based on "last x hands" are not stored in the database. You can create custom statistics that will display hands based in the last X minutes using an expression as discussed
here. To build a custom statistic see
this guide for the basics and
this guide for a deeper walkthrough. The latter was written for PokerTracker 3 but the techniques all apply to PokerTracker 4, the interface is just slightly different.