Cancel Apple Arcade subscription

Re: "Trying to cancel apple arcade subscription but it is not showing in my subscriptions"

Apple support provides an article that may be helpful:

See how to: Cancel a subscription from Apple - Apple Support

Eg: says:

"If you can’t find the subscription you want to cancel

1. Search your email for the words “receipt from Apple” or “invoice from Apple.
2. On the receipt for the subscription, check which Apple Account was used".

Note that in some countries, iCloud+ now includes access to Apple Arcade at no extra charge. In those countries, I believe it is no longer possible to subscribe to Apple Arcade by itself.

I visited the Apple site for one of those countries, and found this:

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What if I’m already subscribed to Apple Arcade, iCloud+, or AppleOne?

• If you currently subscribe to Apple Arcade individually but not iCloud+, you’ll be notified via push notification and email that you’re now subscribed to iCloud+, and you’ll continue to have uninterrupted access to Apple Arcade through your new iCloud+ subscription. Your existing individual Apple Arcade subscription will be cancelled as it’s no longer needed. Your game progress and saves are preserved, and there’s no interruption to your access.
• If you already subscribe to iCloud+, you’ll automatically gain access to Apple TV and Apple Arcade at no additional cost.
• If you subscribe to Apple One, your subscription continues unchanged and includes access to all services in your plan. If you’d like to switch to an iCloud+ subscription instead, go to Settings > Account > Manage Subscriptions.

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I don't know whether this applies to the area where you live – but just offer it as one possible explanation of why you might have Apple Arcade access, without being able to find an Apple Arcade subscription.