I am running the beta of Affinity Designer, but I cannot find a way to use the typographic features of some fonts, especially a way to enter old style numbers.
Normally I can use this features with the standard OSX "CMD-T" window (I use a Dutch localized version of OSX, and I do not know how this is called in English), but Affinity Designer uses a non standard window.
For a graphic designer extended attributes of fonts are a must, so I would be disappointed if these could not be used.