Unfortunately, every shoe I have closely examined in Decathlon has a completely flat inner sole, with no arch support at all...Exactly the sort of shoes I am trying to avoid.
In fact that is the main reason why I won't buy shoes online, as I want to confirm with my own eyes that any shoes I am interested in have arch support built in before I buy, but online sellers rarely, if ever, mention if their shoes have arch support or not.
The COOLJOY trail runners I linked to earlier are one of the rare exceptions as they specifically state that they have arch support built in, in the description for them.
None of the shoes on Aliexpress I looked at mention it either.
You would think that the more you pay for a shoe, the more chance it will have arch support, but in my experience that is simply not the case...Even very expensive trail runners can have flat inner soles, and that can lead to all sorts of pain and foot problems if your planning on doing long distance hiking in them.
As most of the shops are closed due to lockdown, it certainly makes shopping for suitable shoes more challenging...