Drag & drop the video on timeline & play it to check it.
To remove audio from the video, click on edit menu click on detach audio.
You can see there is still we have a link between audio & video.
To remove this linking click on detach track icon (left side of audio track)

Method -1
Now click on the audio track to select it & hit delete key on keyboard.

Method -2
Or click on mute track icon

Method -3
Right click on the audio track and click on mute clip.