Frequency resets when i apply and has no effect

[Trebor]

Change the project sample-rate after the audio is in Audacity …

Project Rate (Hz)

Hello, Audacity used to have a button on the bottom left corner, Project Rate (Hz). I just downloaded the new 3.3 version and it disappeared. Now I am not sure how to change the rate of the project since I am very new to this. Please help.