How to get the corresponding X-Axis value of the Detected Maximum Amplitude?

Hi, I am able to get the maximum amplitude from a data but I also want to get its corresponding X-Axis value. How do I do that?

Here's a look at the reading in my Front Panel:

Looking at the TDMS file of my data. It can be seen that 2.9238 (amplitude) is actually the highest. However, the displayed Fundamental Frequency is not the corresponding value of the highest amplitude.