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From Console:

1

First Step

Login to your Wepwawet Control Panel
2

Second Step

Select your Server
3

Third Step

Make sure to Turn OFF the Server
4

Fourth Step

Under the General Section, Click the Files tab
5

Fifth Step

After that, Click on the server.properties file and go to the line that says allow-nether=true and change it to allow-nether=false and then click one Save Changes.
6

Sixth Step

After that, Head over to General tab, Click on Console and Start the server.
There you go! You have disabled the nether for your world!