Comment 6 for bug 754399

> (…) this issue should be about adding a UI to change this.
> Or should I create a new issue for that?

IMHO no new report is needed: it's a known missing feature and the same reason why bug #214769 has the status 'Confirmed' and not was closed even though the requested alternative icon size (22x22) is available via manually editing the preferences file. As noted in the comments there by the developer who implemented and continually enhanced the 'Icon Preview' dialog: «A general UI change to make it easier would be good.»

I'd rather link this report as duplicate to bug #214769 so that any progress of implementing a GUI for the configuration of the 'Icon Preview' dialog can be tracked in one place.