The default Confidence Level has been set to 95%. This is the same for both tests.
As for the Bayesian test, the Region of Practical Equivalence (ROPE) on the Effect size around the null value has been set by default to [-0.1, 0.1].
The null value is declared to be rejected if the 95% Highest Density Interval (HDI) falls completely outside the ROPE.
You can use Window | Preferences | Tools | Statistical Tools the Preferences to modify:
Checking Null Value Assessment triggers the computation of both tests.
When the mean values are estimated as significantly different, a square is added next to the Impact bar: