local overrides on text style in tables

Leaving aside any discussion on the inherent naughtiness of overrides … I wanted to apply one this morning. It didn't take. I'm wondering why.

Here's a screenshot. After the caption and the header, all the table content uses :ttx. So, to indent the codes, I opened the paragraph designer and applied an 18pt indent to the standard :ttx definition. Nothing happened. Out of curiosity, I cleared the indent I'd tried to apply via the Table cell tab and applied it again via the Basic tab. Still nothing.

Hints and tips welcome, as always.

N