How to make Spectrum and Time overview display simultaneously.

I am using RSA306B and have opened the Spectrum display and Time overview display in the upper computer software Tek SignalVu PC. The Spectrum displays images, but the Time overview does not. How to make both display simultaneously.

Hi,

As the warning on the bottom left corner is telling you, the time overview is disabled when the RSA is sweeping. This happens when the bandwidth is over 40 MHz (which is the max real time bandwidth of the RSA306B).
So the solution is simply to reduce the difference between your start and stop to 40 MHz or less.

Hello, can I take a segment of the signal on the time overview and perform frequency analysis on that segment

Yes, with the Time Overview window open, you can adjust the Offset and Length to change Spectrum or Analysis window.
This is more fully laid out on page 100 of the manual: https://download.tek.com/manual/SignalVu_PC-Help_EN-US-077-0720-18-Rev-A_077072018.pdf

From what you're asking, you probably want to adjust the Spectrum time.