Re: After exporting, the denoiser effect I used is not in the video, but I can hear it well in the project. Why is not applied in the video?

In the audio mixer panel click the little triangle in the top left corner, this will open up the effects area. Click on one of the effects positions on the required track, you will then get the same audio effects options as you get with clip effects. One added to the mixer double click the effect to open up the parameters page.