Fenix 6 Performance Widget Glance

I am seeing cycling metrics in my Performance Widget Glance.

But at this stage of the season, I am cycling more than I am running, and my cycling VO2Max is higher.

Not sure if which is displayed depends on your recent training history.

Yep. 

It displays the most valuable activity or something like that. Not necessarily the most recent. 
Anyway, I have to live with that behavior 

You can of course click through the widget to get more details, including your running and cycling VO2Max separately.

But I get that it would be good to see this in the Glance view.

That's quite unfortunate. I can see the most relevant (or best, or valuable) is placed on the widget quick glance, but I would think there should still be a page detailing my FTP once I advance into the widget details, as it is a important training metric for cycling.

Sucks for triathletes, or I ride a whole lot - but it still values the infrequent runs I do more than the solid list of cycling.. :\ 

That is really dumb that they cannot show performance metrics for both cycling and swimming, especially given they market the Fenix as a multisport/triathlon watch. I wonder if there is a way to make a feature request for this.

I wonder if there is a way to make a feature request for this.

There is. Search for "Garmin Feature Request"