Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Tristan G,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well?
You can cancel subscription purchased from Microsoft store from your Microsoft services and subscription page: https://account.microsoft.com/services
Look for the Lightroom subscription, choose Manage, and then select Cancel.
You can also contact Microsoft store support. Click link, select your region to find contact number: https://support.microsoft.com/help/4f615f2a-6bbd-fd69-6695-ae213d63eef0
Please let me know if you need more assistance.
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Warm Regards