I do not want to see video download panel on some site. How can I disable it?

If you do not want to see IDM video download panel on some site, you need to add it into exceptions list.

To do this, open "Options→General" IDM dialog and press "Edit" near "Customize IDM Downloads panels in browser",

Open 'Customize IDM Download panels in browser' dialog

Then press "Exceptions" button and add site's name in the list.

Open 'Download panel exceptions' dialog

It should be without protocol and you can use asterisk ("*") if this site has different subdomens like "*.mysite.com".

Add new exception for IDM video download panel