How long has "adjust dice" been an option in Beyond on the browser?  I don't think I've seen it on the mobile app.

Can you be more specific as to what you are referring to? I have not seen "adjust dice" anywhere on the site - but then I've not checked every nook and cranny.

Have you ensured this is not limited to an extension you are using, like Beyond20, or something?

I don't use any extensions or other sites/software.  At some point when you right-click a damage button, say for a weapon, you get options for who sees the role, critical damage and now adjust dice was added.  This allows you to add dice for a Vicious weapon or Hunter's Mark for example.

Didn't notice that before, I think it is a fairly recent addition.