From theme options:

Help – https://help.wprentals.org/article/1-30-how-to-manage-submit-form-fields-and-mandatory-fields/

From Custom CSS

 

[for="embed_video_type"] {
display: none;
}
[id="embed_video_type"] {
display: none;
}
[for="embed_video_id"] {
display: none;
}
[id="embed_video_id"] {
display: none;
}