Hi TheHLT,
Re: "Turn off sections in reminder : I have been searching for a way to disable/turn off sections in Reminder".
You don't have to use a Grocery list, sorted automatically into categories if that's not what you want.
ie: You can just create a "Standard" List ... Name it anything you want ... (Grocery Store Name / Date ?).
Apple Support's online article (link below) has the "how to" info. for iOS 18.
You can: Organize multiple lists in Reminders on iPhone - Apple Support
Eg: says:
"Organize multiple lists in Reminders on iPhone
In the Reminders app, you can create new lists, organize the lists into groups, and pin lists for quick access.
Note: All Reminders features described in this guide are available when you use updated reminders in iCloud. Some features aren’t available when using other accounts.
Make a new list
Go to the Reminders app on your iPhone.
Tap Lists (in the top-left corner).
Tap Add List.
Enter a name, then choose a color and symbol for the list.
Tap List Type, then choose Standard, Groceries, or Smart List. "
There are other organizing tips etc. in the above linked article.
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Re: "I hope that Apple listens and reads and offers a way to disable this feature in an upcoming update".
We are all Apple users, like yourself in the community, so it is very unlikely Apple would read your comments here.
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If you wish: You can send feedback to Apple : They will likely not reply, yet your feedback reaches those who work behind-the-scenes at Apple, and can make changes if others are also requesting them. All feedback is carefully read, and logged. Web-form : Feedback - Reminders - Apple
All the best :-)