Garmin Connect cycling laps

3318042 said:

Can I confirm this without checking every activity one at a time ?

Not with Garmin Connect, unless you mean the fastest ride over a specific section your your habitual route. In that case the Segments feature would help,  because it offers personal ranking of all your rides (or runs) on a predefined segment. If you defined the segment in the past, you just open the stats, and select the filter "Only Me", and there you will see how your ride ranks, and whether it was indeed the fastest one.

If you did not create the segment yet, you can do it now, though for including all past rides in the ranking, you'd need to open each of them and click on the link "Match New Segments".

Otherwise, the only cycling distance where Garmin devices detect personal best rides automatically is 40km

There are also 3rd party apps, such as Strava, and others, which may offer more sophisticated features for detecting personal records, and for distance ranking.