Add Descriptive text to Widget text box so users can see what they contain

It looks like the suggestion by @DaveRomsey will solve the problem.

Another simple idea is from a plugin by Stephen Cronin, (I’m not related to that plugin in any way.) that uses the widget_title filter:

add_filter( 'widget_title', function( $title ) 
{
    return '!' === mb_substr ( $title, 0, 1 ) ? '' : $title;
} );

where I’ve adjusted the code a little bit.

It simply removes the widget’s title if it starts with !.

This is handy for e.g. Text Widgets containing ads where we don’t want the widget’s title to display on the front-end. This approach makes it easier to manage the widgets as we can still see their titles in the backend.

Hope it helps!