Super!!
I found it on on my PC under Activities/Table 
Then it is OK it seems. They are source=Zwift.
Before I think I saw the merge activites button, but now I cannot find it. Have that button gone somewhere else?
Did both files come directly from Zwift to Xert? (not Zwift to Strava to Xert)
Not sure, that is what I tried to figure if it was some way to tell
It looks like this is a Zwift activity that has been imported from Strava. When Xert is not able to merge the fit-file the merge button doesn’t show. Zwift activities needs to come directly from Zwift.
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Will Xert analysis be very different if I merge or not merge activities?
When I do workouts, I typically do a workout and that is it.
Race days, I typically do 20-30 min warmup, then the race, then 20-30 min cooldown. I am pondering if it would make sense to merge my race days activities.
If Zwift is configured under Connections to send completed activities to Strava, disable that connection.
Xert Sync should look like this –
In theory, I would think there would be a difference between multiple activities vs one activity. The amount of XSS you accumulate is dependent on your fatigue. With multiple activities your fatigue will start as fresh for every activity. The accumulation of XSS is different after 2 hours than after 2 minutes.
I would also expect the fitness signature algorithm to be affected of the same reason. MPA declines diffently when you’re fatigued than when you’re fresh.
In practice I don’t know how much this matters if at all.
For now, there is likely not a massive net difference between merging or not merging. For me, the primary benefit is tidying the analysis in Xert & on Strava.
Rather than having a Zwift warmup, a race activity, & then a cooldown activity that all partially fill my buckets and clog up my Strava feed, I prefer to ‘gather’ them all in Xert, merge them in to a single file and just push one activity to Strava, like this:
That being said, if your merged activities combine for over 2 hours, then you could calculate a durability score, where that isn’t possible if you have 2 separate 1 hour activities.
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What’s the purpose of saving the durability assessment vs not saving the assessment? or can I just look at each session durability score?
I managed to get my first value at 17.1% 
but I think that is more the result of me not making any hard efforts towards the end, just some Z4 riding and in the beginning I had a punchy race of 45 minutes.
I will do warmup+race+Z4+all out 60 seconds effort. Will this give me a better durability prediction?
I merged 3 activities today. Total of 2 hours and 8 minutes.
When I press assess Durability, I get 0.
I had a near breakthrough. Is that the reason I get 0 in Durability?
Note last sentence in this paragraph: Durability Score – Xert
Thanks.
I read that a “Breakthrough” prevents the durability score to be assessed but wondering if “near breakthrough” gives the same implication. The article didn’t mention “near breakthrough”
Any BT will affect the analysis.
You could flag the activity to remove the BT and see if the merged content includes sufficient MPA action to assess durability.
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Thx. No problem. Just curious how it works. I need to stop making BT and nBT 