This feature allows subtitlers to use different styles for words that are joined by hyphenation and words and punctuation.
If there are words joined by a hyphen, for example "stop-gap" and only the word 'gap' will be italicised then the words should be written like this: "stop- gap" with a space between the different styles.
While in List view, with the cursor at the start of 'gap' ...
..select Edit properties... No Spacing from the right-click menu and the space before 'gap' will be removed.