Hi FrancineF,
We're glad you've reached out for help with this feature of your iPhone. Let's go over all options together.
It sounds like you're initiating the quick actions menu on iPhone inadvertently. Is this correct? Are you noticing this while on the Home Screen, or when using any specific apps?
While there isn't an option to disable the feature, you can change the sensitivity or touch duration, so that the menu doesn't appear as quickly. You'll want to refer to the instructions in this guide to customize this behavior:
Change 3D or Haptic Touch sensitivity on your iPhone - Apple Support
We greatly appreciate your feedback about this, so we'd also like to share the following link you can use to submit your thoughts about it:
Product Feedback - Apple
Have a great day!