The locking on that fork is no longer working in that in locked position, the fork is as unstiff as when not.
On other models, I've been able to remove that blue lever and tighten things underneath to make sure the fork is locked when the lever is in locked position.
However, on this one, I've not been able to remove the lock lever. I've slightly cracked the plastic in a few places trying to pop it off with a flat screwdriver.
What's the trick?
Or is the lever not meant to be removed on that fork?
There's not much in terms of part number written on the fork, but according to the bike description that would be:
SR Suntour NEX HLO 63mm Travel, Alloy Steerer, Hydro Lockout
Bike is a 2021 model, so it could be this one with part number for that lever being FKG426. A duckduckgo search on that only turns up that exploded view.
OK, based on comments, I've tried to give it a good go using screw driver and a few guitar picks. All I've managed to achieve is internal tearing:
I can't find a picture for the FKG426 other than the very low resolution drawing from the exploded view above, but FEG426 I could and looks similar:
As you can see the inner tube-like part, now partly torn from the cap on mine is meant to hook into something and is nothing compared to the ones in youtube videos that are easy to pop off (too easy sometimes, I've had one just coming off by itself during transport on a car bike rack).
I think I've established that one cannot be taken off by brute force only, but am happy to be proven otherwise.
Over the week end, I'll try and see if I can take the whole FKE028-18 off (thanks @Renaud in comments), so see if that lever can be removed from underneath. In any case, it looks like I need a new one.
Though by the look of https://www.srsuntour.us/products/speed-lockout-lever-1, that's attached with a hollow screw whose head I would need to access from underneath the lever.
Strangely enough at that page, we see comments about levers coming off by themselves and others like me breaking it when trying to remove it. Possibly because there have been several iterations of that components or because the replacement you buy there is designed differently so people can undo it more easily than the original.
Well, as anticipated, while I could unscrew the FKE028-18 from the fork body, I was not able to detach the FKE028-18 from the damper body underneath, but after a few attempts, I was able to screw it back on in a way that allows the lever to lock properly.
So for now I no longer need to take it off other than to replace it as it's quite a bit damaged so may allow some water in.