XDJ-RX Search button while track being played

I realized that clicking on search button while track being played, moved back/forward the track by certain number of bars.

But it seems like its not consistent among different track.

some tracks move by 4 bars, some move more or less than 4 bars.

Is there way to control this so that it always moves by 4 bars?

or is it moving by certain time? like 1 second or 2?

What does this button exactly do? and is there way to control this?