How to control span of the frequency sink?

Hello everyone, 

I have a question to ask.  While using the QT GUI Frequency Sink, the y-axis means signal gain/power can be change with respect minimum and maximum. 

However, I need to change the span size of the x-axis, but I did not find the option. Can I change the span size manually?

 Would you like to give me a hint here?

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Sincerely,

Md Atiqur Rahman

Hochschule Bremen